单项选择题

Mary______ a dress when she cut her finger.

A．made
B．is making
C．was making
D．makes
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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
Tom ought not to ______me your secret, but he meant no harm.
A．have told
B．tell
C．be telling
D．having told
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