单项选择题

None of the food was wasted,().

A.were they
B.didn't it
C.was it
D.wasn't it

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单项选择题
You()return the book now. You can keep it till next week if you want to.

A.do not have to
B.haven't
C.can't
D.mustn't
单项选择题
Not until the early years of the 19th century()what heat is.

A.man knew
B.did man know
C.man did know
D.didn't man knew
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