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
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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
单项选择题
“When you leave the room．make sure __________ the door．”
A．of locking
B．you lock
C．for you to lock
D．to lock
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