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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It was last night ______I saw the comet.
A．the time
B．when
C．that
D．which
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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