单项选择题

They （） shopping, when someone knocked at the door.

A. are about to
B. are to go
C. were about to go
D. were to go

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Talking to foreigners is fun if you（）the right time and place.

A. locate
B. consider
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In a second-hand bookshop, Billy came across a book which he thought was certainly a （）edition.

A. rare
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