Bob and Tom said____wouldn't be able to come.
A. they
B. them
C. their
D. themselves
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--Where's your office?--____is on the third floor.
A. It
B. Its
C. Itself
Has anyone seen my keys? I can't find____anywhere.
A. they
B. them
C. their
D. themselves
如果两个异号的补码相加时，有时也能产生溢出。
A. 对
B. 错
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