单项选择题

You'd better （） your computer before you use it again.

A.observe
B.begin
C.check
D.pick

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单项选择题

People appreciate（）with him because he has a good sense of humor.

A.to work
B.working
C.have worked
D. having to work

单项选择题

（） she had never traveled herself, she received vicarious pleasure from reading about interesting places.

A.Because
B.Since
C.Now that
D.Although

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