I have no idea ______ it is that makes him puzzled.

试卷相关题目

• 1I thought Father would be better, but ______it is, he is getting worse, which makes me more worried.

  A.before

  B.as

  C.because

  D.after

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• 2With some technical problems to be solved, it may be a while _______ the system is put into use.

  A.when

  B.after

  C.since

  D.before

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• 3The police came in _______ the thief attempted to rush out of the store.

  A.at the moment

  B.the moment

  C.for the moment

  D.at any moment

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• 4．You'd better get the problem solved as soon as possible ______ it becomes out of control．

  A.when

  B.before

  C.since

  D.unless

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• 5Who was it _______ wanted to see me just now?

  A.whom

  B.that

  C.when

  D.which

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• 6— How can I wake up so early? — Set the alarm at 5 o'clock, _______ you'll make it.

  A.but

  B.or

  C.and

  D.so

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• 7_____ computers are convenient to us in daily life, it may also cause other problems.

  A.Whether

  B.Because

  C.As

  D.While

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• 8 _______ is even more important is _______ _______the earth cooled down, water began to appear on its surface.

  A.When; that; when

  B.What; whether; as

  C.What; that; as

  D.lt; whether; as

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