intherestaurantforhalfanhour,I

__________ in the restaurant for half an hour, I suddenly realized I had left my wallet at home.

A．To wait

B．Having waited

C．Having been waited

D．To have waited

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A．had survived

B．survives

C．survived

D．is surviving

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—Yes, __________the car doesn't break down.

A．unless

B．in case

C．so long as

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A．what

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He chose to teach in a mountain village, though he__________in the city for a better life.

A．could stay	B．would stay
C．could have stayed	D．should have stayed

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