单项选择题

Since their method doesn't work, we can （） other measures.

A．fall on
B．fall down on
C．fall back on
D．fall in upon

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单项选择题

I would have seen him off, had it been possible but I （） so busy then.

A．had been
B．were
C．was
D．would be

单项选择题

He decided to shut （） the shop.

A．up
B．off
C．down
D．with

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