单项选择题

A teacher cannot take it for granted that his students always do their homework ().

A．as follows
B．as required
C．as they have
D．as they do

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单项选择题
I have enjoyed my visit here. I'll be very sorry ().

A．for leaving
B．to leave
C．of leaving
D．with leaving
单项选择题
The traffic was very heavy, () I would have been here half an hour sooner.

A．however
B．otherwise
C．anyway
D．although
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