单项选择题

He said that there was nothing to be ().

A. ashamed
B. ashamed in
C. ashamed of
D. ashamed at

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单项选择题
By next week the new regulations ().

A. will introduce
B. are to introduce
C. are to be introduced
D. will have introduced
单项选择题
There () more than one cause contributing to the accident.

A. were
B. was
C. be
D. have been
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