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    10．She treats the boy very well as though he is her son．

    分析 她对这个孩子很好，好像是自己的儿子一样．

    解答 答案：is-were．考查as though 虚拟语气．根据句义可知，这个孩子并不是她的儿子，所以as though 的从句应该用跟现在事实相反的句式，即过去式，又因为虚拟语气不用was，所以用were．

    点评 考查as though 虚拟语气．
    as though引导条件从句（即假设部分），从句的时态有三种：
    1、从句与主句动作同时：He looks as though he were an artist．--用过去时（am，is，are的过去时都是were）
    2、从句动作先于主句动作：She speaks English so fluently as  though she had studied English in Britain．--用过去完成时．
    3、从句动作后于主句动作：He learns English so hard as though he would go to the U．S．A..--用过去将来时．

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