单项选择题

Tom's mother always told him not to smoke again, but ______ didn't help.

A. he

B. it
C. which

D. as

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单项选择题

—Excuse me, where is the nearest bookshop, please —Sorry, I don't know. —______.

A．You're welcome

B．Thank you all the same
C．I'm sorry to hear that

D．Thanks a lot

单项选择题

The police still haven' t found her, but they' re doing all they （）

A. may
B. can
C. must
D. will

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