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

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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
单项选择题
While all the passengers made for the exit, he alone remained in his seat, as if()to leave the plane.

A.be unwilling
B.his unwilling
C.unwilling
D.him unwilling
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