单项选择题

______ you're early you can't be sure of getting a seat.

A．If
B．Unless
C．When
D．Because
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单项选择题
Some people like drinking coffee, for it has ______ effects.
A．promoting
B．stimulating
C．enhancing
D．encouraging
单项选择题
Small talk is a good way to kill time, make friends and ______ something with others.
A．argue
B．replace
C．share
D．match
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