单项选择题

It was last night ______I saw the comet.

A．the time
B．when
C．that
D．which
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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
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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