单项选择题

I was on the point of going to bed ______ Mr. Zhang rang.

A. as
B. when
C. while
D. and
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单项选择题
About ______ the people of the town are workers.
A. sixty percent
B. sixty percent of
C. percent sixty
D. sixty percents of
单项选择题
The roof fell ______ he had time to dash into the house to save his baby.
A. as
B. after
C. until
D. before
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