单项选择题

Attendances at basketball matches have （） since the coming of television.

A. dropped in
B. dropped down
C. dropped off
D. dropped out

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（） 1980 that Voyager transmitted photographs of Saturn to earth.

A. When it was
B. That was in
C. During
D. It was in
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If the building project （）by the end of this month is delayed, the construction company will be fined.

A. being completed
B. is completed
C. to be completed
D. completed
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