单项选择题

You should have your eyes tested every year in case the ______ of your spectacles need changing.

A. lenses
B. glasses
C. sights
D. crystals
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单项选择题
If you want to know the train schedule, please ______ at the booking office.
A. acquire
B. inquire
C. request
D. require
单项选择题
It is only when you nearly lose someone ______ fully conscious of how much you value him.
A. do you become

B. then you become
C. that you become

D. have you become
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