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Scientists have reached the disturbing conclusion __________ the amount of the solar energy reaching the Earth's surface has been gradually falling.

A．that	B．why
C．whether	D．what

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If you are able to talk to a friend over the telephone, you feel that you are close ____ the actual distance is not shortened.

A．so long as

B．if

C．even if

D．as

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—I felt it very difficult to carry on the work all by myself.
—I could have helped you, but you _____me to.

A．hadn’t asked

B．didn’t ask

C．haven’t asked

D．don’t ask

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Mr. Smith has bought a new house in the country, around ____ some green trees.

A．which is

B．it is

C．which are

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All the task ahead of time, they decided to go on holiday for a week.

A．had been finished	B．were finished
C．having been finished	D．been finished

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The doctor had almost lost hope at one point, but the patient finally.

A．pulled out

B．pulled through

C．pulled up

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