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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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
单项选择题
—Oh．I failed again． —Don't lose heart．One more effort，______ you will succeed．
A．so that
B．therefore
C．however
D．and
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