单项选择题

The law requires all cars () for safety and efficiency.

A.being
B.to
C.be
D.regularly

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单项选择题

The weight of something is another way of describing the amount of force exerted on () by gravity.

A.it
B.them
C.that
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单项选择题

Prior () his departure, he wrote a letter to his mother.

A.of
B.from
C.to
D.in