单项选择题

If law and order（）not preserved, people will not he able to live a secure life.

A. are
B. were
C. is
D. was

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单项选择题
You （） our case very convincingly. The jurors were clearly impressed.

A. represented
B. presented
C. promoted
D. probed
单项选择题
If（）, he promises that he will spare no effort in promoting public welfare.

A. elected
B. elect
C. electing
D. being elected
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