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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单项选择题
At last, about twent7 people ______ at the meeting.
A．turned on
B．turned up
C．turned off
D．turned out
单项选择题
______I knew the news, I told you.
A．As
B．As though
C．As far as
D．As soon as
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