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This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.

A．have reflected

B．are reflecting

C．will reflect

D．reflected

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On hearing a great noise, Mike looked forward through the window _____
what happened outside the room.

A．to seeing

B．to see

C．seeing

D．to have seen

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We hadn't met for 20 years, but I recognized her_____ I saw her.

A．the moment	B．for the moment
C．the moment when	D．at the moment when

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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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