–Ithinkit’sgoingtobeabigproble

–I think it’s going to be a big problem.
--Yes, it could be.
--I wonder ________ we can do about it.

A．if

B．how

C．what

D．that

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A．By the way

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A．in addition

B．in brief

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A．equivalent

B．uniform

C．alike

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A．discourage

B．decrease

C．disturb

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