单项选择题

Historically, () main material for making tables has been wood, but()metal and stone have also been used.

A. the; 不填
B. 不填; 不填
C. the; the
D. 不填; the

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单项选择题

Mr. Green drove slowly on the way home until he reached the high way, () the speed limit was 60 miles per hour.

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

单项选择题

So far, several ships have been reported missing () the coast of Bermuda Island.

A. off
B. along
C. on
D. around

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