单项选择题

My grandfather ______ the Red Army 40 years ago.

A．joined
B．took part in
C．attended
D．joined in
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单项选择题
A．I’m Mary.B．Can I help youC．Sorry, the line is busy.D．Sorry, he’s not in.
A．I’m Mary.
B．Can I help you
C．Sorry, the line is busy.
D．Sorry, he’s not in.
单项选择题
We are living in an age ______ many things are done on computer.
A．which
B．that
C．whose
D．when
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