单项选择题

— Who's speaking
— ______ John Smith.

A. I'm
B. This is
C. It's
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单项选择题
We are sure ______ e-mails to you.
A. to send
B. sending
C. send
单项选择题
It was said that Mr. Black ______ to Europe on business.
A. has gone
B. had gone
C. went
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