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(2012·全国卷Ⅰ)I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.
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A
couldn't
B
mustn't
C
shouldn't
D
needn't
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Tom’s boss told Tome that if he worked hard, he _____ have a rise.
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may
B
ought to
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Something ___ to save our earth. Do you think so?
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A
can do
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must do
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A
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not be operated on
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A
won’t
B
needn’t
C
can’t
D
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Mr. Brown, a good friend of mine, __________ us but that he was short of money at the time.
#89710
A
would help
B
would have helped
C
had helped
D
helped