单项选择题

Tom must have practiced swimming with his father last Sunday, ______ he

A．didn't
B．hasn't
C．wasn't
D．mustn't
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-- ______ are your parents -- They are both teachers.
A．Who
B．Whom
C．What
D．Which
单项选择题
Be quiet! It's rude to ______ people when they are talking.
A．stop
B．introduce
C．prevent
D．interrupt
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