单项选择题

______ blood if you can and many lives will be saved.

A．Giving
B．Give
C．Given
D．To give
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单项选择题
—Who is Jerry Cooper —______ I saw you shaking hands with him at the meeting.
A．Don't you meet him yet
B．Hadn't you met him yet
C．Didn't you meet him yet
D．Haven't you met him yet
单项选择题
Robert is said ______abroad, but ! don't know what country he studied in.
A．to have studied
B．to stay
C．to be studying
D．to have been studying
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