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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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
单项选择题
I have left my watch in the living-room. Would you please () it for me

A.take
B.bring
C.to carry
D.fetch
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