单项选择题

If I hadn't given you a hand in time of crisis, you ______ on air now.

A. couldn't have put

B. wouldn't be putting
C. didn't put

D. won't put
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单项选择题
The average wavelength of visible light is 2,000 times ______ the diameter of an atom.
A. much as
B. greater than
C. as great
D. more than that
单项选择题
We have met with so many difficulties. At last, we can see light at the end of the ______.
A. battle
B. tunnel
C. road
D. day
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