A. it is not
B. it were not
C. were it not
D. they were not
第1题
Everything on the earth _____ all the time.
A. is changing
B. is changed
C. has changed
D. has been changed
第2题
I started my teaching career at the school. That was more than twenty years ago, and I _____ there ever since.
A. was
B. had been
C. will be
D. have been
第3题
It is certain that men will never stop _____ new energy sources to power their growing industry.
A. finding
B. to find
C. having found
D. found
第4题
Since taxi fare in the city may run _____ twenty dollars, I suggest that you take a bus.
A. as high as
B. as expensive as
C. so high that
D. so expensive as
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