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
A lot of travelers _________down the wrong road by the wrong sign.
A．had been misled
B．had misled
C．hadn't led
D．hadn't been led
单项选择题
There has been some _________of entry into American schools to Chinese students.
A．limit
B．restriction
C．confine
D．imprisonment
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