单项选择题

According to the law which he later produced, everything in the universe attracts everything else towards ().

A. it
B. everything
C. itself
D. each

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单项选择题
The millions of calculations involved,()by hand, would have lost all practical value by the time they were finished.

A. had they been done
B. they had been done
C. having been done
D. they were done
单项选择题
Televisions enable us to see things happen almost at the exact moment ().

A. which they are happening
B. they are happening
C. which they happen
D. they have happened
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