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
Why did the man become worried
[A] Because he had a train to catch.
B. Because he was hungry.
C. Because he was waiting for a friend.
单项选择题
When Shaw settled in New York, who did he first write for
A． Newspapers.
B． A local magazine.
C． The New York Times.
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