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听力原文：M: Our headmaster has been busy since last month. He never stops working until tw

elve o'clock at night as I know.

W: I should never have troubled him so much, had I known he was so busy.

Q: What do we learn from this conversation？

(17)

A．The woman has troubled the headmaster.

B．The woman has not troubled the headmaster.

C．The headmaster has not been busy this month.

D．The man has troubled the headmaster very much.

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