workhasbeendonetopreventtheriv

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_____ work has been done to prevent the river being polluted.
A .A number of B A mass of C Several D. A good many

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——Will you stay for lunch?
——Sorry，. My brother is coming to see me.

A．I mustn’t

B．I can’t

C．I needn’t

D．I won’t

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Seeing the enemy, Gary was behaving as though nothing.

A．happened

B．had happened

C．would happen

D．was happening

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——Whoit be that is knocking at the door?
——Itbe Father, but I’m not sure.

A．can; must

B．can; may

C．must; can

D．may; must

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She spent a happy afternoonall her coins and stamps according to time and designs.

A．sorting out

B．taking out

C．watching over

D．selling out

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On the graduation day, he received from his father a nice presenta note was attached, saying “I’m proud of you.”

A．on which

B．to which

C．with which

D．in which

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