单项选择题

Not until the early years of the 19th century ______ know what heat is.

A. did man

B. man did
C. have man

D. man have
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单项选择题
A. I will go swimming. B. I think it begins at 3 o’clock. C. Sorry, I’ve no idea. D. I don’t know who it is.
A. I will go swimming. B. I think it begins at 3 o’clock.
C. Sorry, I’ve no idea. D. I don’t know who it is.
单项选择题
It takes Earth about 365 days ______ one orbit around the sun.
A. to complete

B. complete
C. completing

D. being completed
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