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. ___ to nuclear radiation, even for a short time may produce variants（变异体）of genes in human bodies.

A．Being exposed	B．Having exposed
C．Exposed	D．After being exposed

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To our ______, the result of the experiment is much better than we expected.

A．relief

B．regrets

C．disappointment

D．sorrow

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— Remember the first time we met, Jim?
— Of course I do. You _______ in the library.

A．have read

B．had read

C．were reading

D．read

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We hadn’t been out for long _________ she felt sick.

A．as

B．while

C．after

D．before

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________ a little money, Jane was able to buy her mother a lovely new watch.

A．To save

B．Saving

C．Having Saved

D．Saved

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The weather turned out to be fine yesterday. I ________the trouble to carry my umbrella with me.

A．should have taken

B．could have taken

C．mustn't have taken

D．needn't have taken

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