单项选择题

() many times, he still doesn't know how to use the computer.

A.He has been told
B.We have told him
C.Having been told
D.Having told him

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单项选择题
There are no lights on and no one answer the doorbell. They () be at home.

A.will not
B.should not
C.cannot
D.must not
单项选择题
I've decided to () your advice and stop smoking for ever.

A.take
B.receive
C.believe
D.consider
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