单项选择题
21()
A.because
B.however
C.besides
D.therefore
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单项选择题
______ you go there early, there won't be much a chance of getting a ticket.
A.Until
B.If
C.Unless
D.If only
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单项选择题
If there are any new words, ______ in a dictionary.
A.look them through
B.look them up
C.look them over
D.look them up and down
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