单项选择题

They () us since five o'clock this morning until now.

A. are helping
B. help
C. have helped
D. have been helping

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单项选择题
The police don't know who committed the crime, but they () Jones.

A. doubt
B. suspect
C. regard
D. consider
单项选择题
He has a () tongue, but is usually sorry afterward.

A. swift
B. fast
C. rapid
D. quick
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