单项选择题

Somebody had told you the truth,______.

A. hasn't he
B. didn't he
C. haven't they
D. didn't they
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单项选择题
To ______ the risk of theft, install a good alarm system.
A. decrease
B. minimize
C. limit
D. eliminate
单项选择题
I don't have the key, so I have to use ______ to open this locked door.
A. strength
B. vigor
C. energy
D. force
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