单项选择题

Mr. Grey has two sons,______ are famous dancers.

A．both they
B．both of them
C．they both
D．both of whom
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单项选择题
It's a long time since he left his England, ______
A．didn't he
B．hadn't he
C．wasn't it
D．isn't it
单项选择题
Good-bye, Mr. Smith. I'm very pleased______.
A．to meet you
B．to have met you
C．meeting
D．having met you
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