Sincethetimehumankindstartedga

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Since the time humankind started gardening, we _ _ to make our environment more beautiful.

A．try	B．have been trying
C．are trying	D．will try

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There were many more people who got injured in the big fire than _______.

A．was reported	B．it was reported
C．were reported	D．they were reported

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This robot is supposed to save a lot of labor, but it remains a problem
if it ______.

A．is

B．saves

C．does

D．has

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George applied for the position three times ______ he finally got it.

A．before

B．until

C．when

D．after

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With his eyes ______ on the family album, he thought of the fun he had when
he lived with his parents.

A．fixing

B．fixed

C．to be fixed

D．being fixed

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The country life he was used to _____ greatly since the opening policy.

A．change

B．has changed

C．changing

D．having changed

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