单项选择题

We were talking about the American tourist ______we met during our trip to the Great Wall.

A．what
B．which
C．whose
D．whom
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单项选择题
After I ______ for half an hour, I realized that he was not coming.
A．have waited
B．waited
C．had been waiting
D．was waiting
单项选择题
The old man has two daughters, ______are doctors.
A．both of them
B．both of whom
C．both who
D．they both
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