Greatchangesinhishometowninthe

Great changes _______ in his hometown in the last twenty years.

A．were taken place	B．have taken place
C．have been taken place	D．took place

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_______, the more exercise you do, the richer your knowledge will be.

A．It is known to all	B．Which is known to all
C．As we all know	D．As is known to all that

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His mother happened _______ when his program was shown on Channel Young.

A．watching TV	B．to watch TV
C．to be watching TV	D．being watching TV

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By the time he was ten, Edison _________ experiments in chemistry.

A．had already done	B．already had done
C．was already doing	D．already did

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The businessperson wanted to sell his goods fast; ______, he chose his partner with great care.

A．therefore	B．otherwise
C．for	D．however

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Do you know the man____ is talking with Tom?

A．which

B．who

C．whom

D．whose

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