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【参考答案】

does→did
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单项选择题
A．Because the waitress is too busy.B．Because the duck takes quite a while to prepare.C．Because he hasn’ t ordered .
A．Because the waitress is too busy.
B．Because the duck takes quite a while to prepare.
C．Because he hasn’ t ordered .
单项选择题
A．The man is honest.B．The man is polite.C．The man is dishonest.
A．The man is honest.
B．The man is polite.
C．The man is dishonest.
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