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
If you are not ______ by then, I'll take you to see the doctor.
A． good
B． fine
C． better
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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