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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—Why can't I smoke here —At no time in the meeting-room.
A．is smoking permitted
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It was last night ______I saw the comet.
A．the time
B．when
C．that
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