Amandoesnotknowthedifficultyof

A man does not know the difficulty of anything _______ he does it personally.

A．although

B．if

C．because

D．unless

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It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind，　　　　？

A．was it

B．wasn’t it

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D．didn’t they

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A．when

B．which

C．where

D．there

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A．before

B．as

C．because

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— I_______in the heavy traffic .Otherwise I_______ here earlier.

A．have got stuck; would have come	B．got stuck; was
C．got stuck ; would have come	D．had stuck ; would come

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A．appreciated

B．enjoyed

C．delivered

D．seized

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