单项选择题

Many an airplane and many a big gun __________ in the exhibition．

A．are shown
B．has been shown
C．has shown
D．shown
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单项选择题
I __________ come yesterday but I had an important meeting to attend．
A．had to
B．must have
C．ought
D．was to have
单项选择题
You must walk through the underground __________ to get across that busy street．
A．pass
B．past
C．passage
D．passenger
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