单项选择题

We can always change the dates of our trip, ______ it"s necessary.

A．if
B．though
C．or
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单项选择题
—Must I wash the dishes at once—No, you ______. You can do it later.
A．mustn"t
B．needn"t
C．shouldn"t
单项选择题
Would you mind ______ me for a minute, Ellen
A．help
B．to help
C．helping
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