单项选择题

Which is Lucy's bag, the yellow one ______ the red one

A．and
B．but
C．or
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单项选择题
I ______ from him since he left.
A．didn't hear
B．haven't heated
C．haven't heard
单项选择题
He ______ while I was studying.
A．played
B．plays
C．was playing
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