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
Human beings are superior to animals()they can use language as a tool to communicate.

A.like
B.while
C.when
D.for
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