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7.-I don't care for baseball.
-How can you say you don't like something        you've never even tried it!(  )
A.tillB.afterC.unlessD.When

分析 -我不喜欢棒球.
-你(如果)试都没试,怎么可以说不喜欢呢?

解答 答案D.
till直到,引导时间状语从句.after"在…之后",引导时间状语从句.unless"除非,如果不",在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用,引导条件状语从句.when"在…时候",引导时间状语从句,但是when还可以表示条件,相当于 if,引导条件状语从句.在本题中考察的就是when表示条件,引导条件状语从句的情况.故答案选D.

点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.
when作为从属连词,引导状语从句,表示多种语法意义:
  1.表示时间,意为"当…时;在…的时候".
  A.在时间、条件等状语从句里,用一般现在时表示将来时;当需要表达将来完成的意义时,必须使用现在完成时来代替.
  如:( 1 ) When you see him,please say hello to him.见到他时,代我问他好.
  ( 2 ) When you have finished your experiment,please tidy the lab and put everything back in the cupboards.当你们做完实验后,请把实验室整理好并把物品放回柜子中.
  B.表示过去发生的事情,在 when 引导的时间状语从句的主从复合句中,动作发生在先的用过去完成时,在后的用过去时.
  如:( 1 ) When I was in Japan,I bought some beautiful pearls.我在日本时,买了一些漂亮的珍珠.
  ( 2 ) When I reached the station,the train had left.当我到达火车站时,火车已经开走了.
2.表示前面的叙述所没有提到过的信息.它总是对所描述的事件予以引人注目的强调,意为"这时;突然";当位于句末的分句具有引种用法时,大致有以下三种情况:
  A.when 分句前面的分句使用过去进行时.
  如:( 1 ) He was still smiling when the door opened and his wife came in.他正笑着的时候,门突然开了,他妻子走了进来.
  ( 2 ) I was thinking of this when I heard my name called.我正想着这件事时,突然听到有人叫我的名字.
  B.when 分句前面的分句使用 was (were) about to,was (were) on the point 等.
  如:( 1 ) We were about to start when it began to rain.我们刚要出发就开始下雨了.
  ( 2 ) He was on the point of leaving when someone knocked at the door.他刚要走就有人敲门.
  C.when 分句之前的分句用过去完成时,其中 sb had hardly/scarcely/barely …when 已成为固定词组.如:
  ( 1 ) We had hardly fallen asleep when the bell rang.我们刚刚入睡,铃声就响了起来.
      ( 2 ) He had scarcely arrived when he had to leave again.他刚刚到达就又要离开了.
  3.表示条件,相当于 if,引导条件状语从句.
  如:How can I get a job when I can't even read or write?如果我连读和写都不会,我怎么能找到工作呢?
  4.表示对比,主要有以下两种情况:
  A.相当于 whereas,while,since,意为"既然;然而".
  如:( 1 ) How can I help them to understand when they won't listen to me?既然他们不愿听我的,我又怎么能帮助他们弄明白呢?
  ( 2 ) They have only three copies when we need five.他们只有三本,而我们却需要五本.
      B.when 从句中使用虚拟语气,意为"本来…却…".
  如:( 1 ) She paid when she could have entered free.本来可以免费入场,而她却付了款.
  ( 2 ) She stopped trying when she might have succeeded next time.她本来下次有可能获得成功,但她却不再尝试了.
  ( 3 ) They were gossiping,when they should have been working.他们本该工作,却在那里说别人的闲话.
  5.由 when 等引导的状语从句,如果主语与主句的主语一致或是 it,谓语动词又含 be 动词时,主语和 be 动词常常被省略,就变成"when+V-ing/V-ed/adj/介词词组"的结构.
  如:( 1 ) When in Rome,do as Romans do.入乡随俗.
  ( 2 ) When (we are ) young,we are full of hope.年轻时,我们大家总是充满希望.
  ( 3 ) Don't reach sideways when standing on a ladder.站在梯子上时,不要侧着身子去够东西.

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