单项选择题

I telephoned him twice and I couldn’t get through to his home. The line must have been out of order,（）

A. doesn’t it
B. wasn’t it
C. mustn’t it
D. hadn’t it

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What would the woman like to drink（）

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B. Milk.
C. Tea.
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Mary（）a book about China last year, but I don’t know whether she has finished it.

A. has been writing
B. wrote
C. has written
D. was writing
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