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______ environmental damage is done，it takes many years for the ecosystem to recover．

A．Even if	B．If only
C．As if	D．Once

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It was with the help of the local guide ________ the mountain climber was rescued.

A．who

B．that

C．when

D．how

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It was only after he had read the papers________Mr.Gross realized the task before him was extremely difficult to complete.

A．when

B．that

C．which

D．what

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It was not until near the end of the letter________she mentioned her own plan.

A．that

B．where

C．why

D．when

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Only by increasing the number of doctors by 50 percent________properly in this hospital.

A．can be the patients

B．can the patients be treated

C．the patients can be treated

D．treated can be the patients

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At no time________the rules of the game.It was unfair to punish them.

A．they actually broke	B．do they actually break
C．did they actually break	D．they had actually broken

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