单项选择题

I first met Lisa three years ago when we ______ at a radio station together.

A．have worked
B．were working
C．had worked
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单项选择题
— Who ______ that piano— My sister, when she ______ time.
A．plays; has
B．is playing; has
C．plays; is having
单项选择题
—Where's Mary now Do you know— No, but I heard ______ in her room a few minutes ago.
A．her singing
B．her sing
C．she was singing
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