单项选择题

The students______ busily when Miss Brown went to get a book she ______in the office.

A．had written; left
B．were writing; has left
C．had written; had left
D．were writing; had left
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单项选择题
Mary______ a dress when she cut her finger.
A．made
B．is making
C．was making
D．makes
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
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