单项选择题

（）, glasses can correct most sight defects in healthy eyes.

A. When well-fitted
B. If well-fitting
C. When well-fitting
D. If well-fitted when

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单项选择题
—Have you ever gone water-skiing before —Oh, yes,（）

A. a dozen of time
B. dozens of times
C. dozens of time
D. dozen of time
单项选择题
Which of the following sentences indicates prediction
A. You must be back by 10 o’clock~
B. He has to move the desk himself.
C. You should mind your own business.
D. The book should attract all lovers of poetry.
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