单项选择题

It's impossible for a child to do so much work within a short period of time, ______

A. isn't it


B. is it
C. has it



D. hasn't it
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—What do you think of the concert —I really enjoy it. I didn't expect it was ______ wonderful.
A. as



B. more
C. most



D. very
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—When was the first man with A(H1N1) flu in mainland China known for sure —______ May 11, 2009.
A. In
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C. For
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