Doyouknowhowlongthedinosaurson

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Do you know how long the dinosaurs _____ on the earth before their extinction?

A．had existed	B．had been existed
C．have existed	D．have been existed

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I witnessed the gate of the bank _______ open and many men entering it, but I couldn’t make them out in the darkness.

A．force

B．be forced

C．forcing

D．being forced

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— I didn’t care about what other people thought about me.
— Well, you ________.

A．should

B．ought to have

C．would have

D．could

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As a result of __ is now known in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.

A．it

B．what

C．which

D．that

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These teenagers don’t know much of the world yet; that’s why they are so easily_____.

A．taken in

B．taken up

C．taken on

D．taken off

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It is the interaction between people, rather than the events __ occur in their lives, __ is the main focus of social psychology.

A．that, that

B．that, which

C．which, which

D．that, what

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