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
There s ______ work to do at once.
A．too much
B．much too
C．too many
单项选择题
There s something wrong with one of my ______.
A．tooth
B．teeth
C．tooths
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