You should not go rafting you know how to swim.A．ifB．if notC．whenD．unless——青夏教育精英家教网—

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科目： 来源：不详 题型：单选题

You should not go rafting ________ you know how to swim.

A．if

B．if not

C．when

D．unless

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科目： 来源：不详 题型：单选题

Don’t lose heart; __________ difficulties you are faced with will be overcome in the end.

A．however

B．whatever

C．what

D．How

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科目： 来源：不详 题型：单选题

---- Are your family ready for rafting?
----Yes, I really want my children to experience that they are young.

A．\

B．if

C．unless

D．while

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科目： 来源：不详 题型：单选题

—My son is addicted to computer games. He is hopeless, isn't he?
—Yes, _____ he is determined to give up and start all over.

A．if

B．when

C．even if

D．unless

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科目： 来源：不详 题型：单选题

He didn’t come to school yesterday _______ that he was ill.

A．because

B．for

C．in

D．if

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科目： 来源：不详 题型：单选题

--- Do you really think I can achieve my goal ?
--- Absolutely .___ you give up halfway .

A．If

B．Unless

C．Since

D．because

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科目： 来源：不详 题型：单选题

I’d like to study law at university _____ my cousin prefers geography.

A．as

B．though

C．if

D．while

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科目： 来源：不详 题型：单选题

The number of private cars in urban areas should be limited ___________the number of public buses should be increased.

A．when

B．while

C．unless

D．until

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科目： 来源：不详 题型：单选题

___________Mrs Smith worked day and night, he found it difficult to make enough money to support such a large family.

A．Since

B．If

C．Once

D．Although

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科目： 来源：不详 题型：单选题

Sorry to say it will be years _______ we really have classes here with only 25 students.

A．since

B．that

C．when

D．before

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