单项选择题

Plastics are the best insulator of electricity, rubber ______ it closely.

A. following
B. followed
C. to follow
D. being followed
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单项选择题
The millions of calculations involved, had they been done by hand, ______ all practical value by the time they were finished.
A. could lose


B. would have lost
C. might lose


D. ought to have lost
单项选择题
The new type of machine ______ the year after next.
A. is going to being turn out
B. is going to have turned out
C. is going to turn out

D. is going to be turned out
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