单项选择题

There are signs （） they are cheating us.

A. that
B. which
C. where
D. on which

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单项选择题
He will have to account ______ Mr. Roberson missing the client meeting. （）

A. with, for
B. with, on
C. to, for
D. to, on
单项选择题
They （） a warm welcome to our visit.

A. provide
B. offer
C. extend
D. show
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