问题描述：
----Please try () out the math problem.-----I 'm too tired ()
A.to work; to tink it about
B.working; to think it about
C.working; to think about it
D.to work; that I can't think about
A.to work; to tink it about
B.working; to think it about
C.working; to think about it
D.to work; that I can't think about
问题解答：
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