单项选择题

— Who ______ that piano
— My sister, when she ______ time.

A．plays; has
B．is playing; has
C．plays; is having
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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
单项选择题
This morning I went to work in such a hurry that ______ the key to my office at home.
A．forgot
B．missed
C．left
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