单项选择题

Visitors （） not to touch the exhibits．

A．will request
B．are requested
C．are requesting
D．request

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单项选择题
Johnny, you play with the knife; you ______ hurt yourself
A. won’t; can’t
B. can’t; shouldn’t
C. shouldn’t; must
D. mustn’t; may
单项选择题
—Why didn’t you buy a new car —I would have bought one if I（）enough money.

A. had
B. have had
C. would have
D. had had
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