单项选择题

By the time you arrive in London, we ______ in Europe for two weeks.

A. shall stay
B. have stayed
C. will have stayed
D. have been stayin
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单项选择题
Expected noises are usually more ______ than unexpected ones of the like magnitude.
A. manageable
B. controllable
C. tolerable
D. perceivable
单项选择题
The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.
A. which to base on
B. on which to base
C. to base on which
D. which to be based on
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