单项选择题

Cheap coal ______ a lot of smoke.

A．gives up
B．gives in
C．gives away
D．gives off
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单项选择题
Not until the early years of the 19th century ______ what heat is.
A．man did know
B．man knew
C．didn't man know
D．did man know
单项选择题
Do you know the boy ______ under the big tree7
A．lay
B．lain
C．laying
D．lying
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