—I _____ thank you enough for what you have done for me.

—I _____ thank you enough for what you have done for me. —You’re welcome.

#87895

may not

will not

must not

can not

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________ the present unemployment continue, the society would face a more troublesome situation.

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Would

Should

Might

Could

----Mary broke up with me!----You ______ have forgotten about the Valentine's Day．

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shouldn't

couldn't

needn't

mustn't

 — Where is John?   — He _____ in the library.

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should be

must be

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He was very busy yesterday；otherwise，he ______ to the meeting.

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would come

came

would have come

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Had I known about this computer program, a huge amount of time and energy________.

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would have been saved　　

had been saved

will be saved

was saved

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