"being done" or "having been done"

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xxwzs

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Sep 27, 2014
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Please take a look at the below:
1. The experiment cannot be carried out because of the equipment ______.
A. being destroyed B. having been destroyed
2. Russia will soon return two islands to China ______ 40 years of negotiations.
A. ending B. to end
3. Russia will soon return two islands to China, ______ 40 years of negotiations.
A. ending B. to end
4. Russia will soon return two islands to China, mainly ______ 40 years of negotiations.
A. ending B. to end
Do A and B both function grammatically and logically? Or there is a better?
I have got a little confused with non-predicate verbs. Thank you so much for your answer.
 
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emsr2d2

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Where did you find the exercise? Is it homework?
 

teechar

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Is this homework that you'll submit to your teacher?
 
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