单项选择题

Not until the early years of the 19th century（）what heat is.

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

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单项选择题
—Nancy is not coming tonight. —But she（）!

A. promises
B. promised
C. will promise
D. had promised
单项选择题
Parents have to accept their children for（）they are and not（）they want them to be.

A. who; what
B. where; who
C. what; why
D. how; when
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