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

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There () more than one cause contributing to the accident.

A. were
B. was
C. be
D. have been
单项选择题
The writer was always looking for suitable () to use in his next story.

A. contents
B. articles
C. pages
D. ideas
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