单项选择题

Barbara did not have time to go to the concert last night because she was busy ______ for her lecture.

A．to preparing
B．to be prepared
C．preparing
D．being prepared
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单项选择题
My grandfather ______ the Red Army 40 years ago.
A．joined
B．took part in
C．attended
D．joined in
单项选择题
The wine ______ a little bitter this time.
A．tastes
B．sounds
C．looks
D．feels
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