题目内容

I’m especially glad that Bob decided to come to the party because we ________ him for several months.

A. haven’t seen
B. don’t see
C. didn’t see
D. hadn’t seen

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A nail has got into the machine. That’s ________ is wrong with it.

A. which
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We should stick to ________ is true.

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A. as
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A. 判断系统平稳性
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