单项选择题

I wish I ______part in the concert, but I had to prepare for the examination.

A．have taken
B．took
C．might have taken
D．could have taken
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单项选择题
Mobile phone, e-mail and telephone ______of people's social communication nowadays.
A．are the most three common means
B．are the three most common means
C．are the most common three means
D．are three the most common means
单项选择题
Traffic accident is reported ______the No. 1 killer of men over the past few years in this little town.
A．being
B．having been
C．to be
D．to have been
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