单项选择题

—Your phone number again I______ quite catch it.
—It's 6956-8442.

A．didn't
B．couldn't
C．don't
D．can't
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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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