There is hardly an environment on earth____________ man has not adapted successfully.
A. to which
B. wherever
C. so that
D. as to
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19. There is no point ____________the piano unless you practise every day.
A. to learn to play
B. in leaning to play
C. by learning to play
D. having learned to play
We didn't go shopping yesterday because it ____________ all day.
A. had rained
B. would rain
C. was raining
D. has been raining
汽车的低压导线采用单股线。（）
A. 对
B. 错
汽车的低压导线采用多股线。（）
A. 对
B. 错
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