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单项选择题

The police warned people to be ______ guard against pickpockets during the Christmas rush.

A. in
B. with
C. to
D. on
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单项选择题A good idea ______ him that he should buy a used car with the money.

A. hit
B. struck
C. beat
D. caught

单项选择题As he crossed the room to the instrument, he knew that the gun was still ______.

A. aimed at
B. shot to
C. pointed about
D. fired against