单项选择题

-- 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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单项选择题
The boss told his secretary to ______ the documents for later use.
[A] turn on
[B] put away
[C] make up
[D] break out
单项选择题
Ten years passed, and I found that he had______.
[A] some white hair
[B] a few white hairs
[C] a few white hair
[D] much white hair
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