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
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The roof fell ______ he had time to dash into the house to save his baby.
A. as
B. after
C. until
D. before
单项选择题
You may borrow this book ______ you promise to give it back.
A. in case
B. so long as
C. as if
D. even if
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