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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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
单项选择题
Tom make up his mind to get a seat for the football match ______ it means standing in a queue all night.
A. as if
B. as though
C. even if
D. whatever
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