Whenaboutoneofthebiggestproble

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When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．

A．asked

B．being asked

C．having asked

D．asking

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we decided to spend the night at the foot of the mountain.

A．With the moon appeared	B．The moon appeared
C．The moon being appeared	D．As the moon appeared

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The American Civil War lasted four years the North won in the end.

A．after

B．when

C．before

D．since

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----Have you any letters _______, sir?
---No, thanks. You may take a rest.

A．to type

B．to be typed

C．to be typing

D．typed

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There sat an old man in a black coat, his head in his hands thinking.

A．put

B．with

C．and

D．for

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Don’t be too rude to your father. Never in his life _____ in that way.

A．has he spoken to	B．he has spoken to
C．has he been spoken to	D．he has been spoken

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