单项选择题
21()
A. of
B. at
C. for
D. on
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单项选择题
He gave up ______on medical advice.
A.drinking
B.to drink
C.drink
D.to being drink
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单项选择题
You can go out, ______you promise to be back before 11 o'clock.
A.even though
B.ever since
C.as far as
D.as long is
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