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
Good-bye, Mr. Smith. I'm very pleased______.
A．to meet you
B．to have met you
C．meeting
D．having met you
单项选择题
—Have you examine them all —Yes,______.
A．each one
B．every one
C．each
D．every
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