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___rock had fallen from the cliff and now blocked the road.

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___rock had fallen from the cliff and now blocked the road.
A.Masses of B.A great mass of C.A much mass D.A mass of
选哪个,为什么其他的不行.要区别!= =谢谢了
___rock had fallen from the cliff and now blocked the road.
选项B是正确的.
选项A后面接可数名词的复数形式,选项B接不可数名词,rock是不可数名词,选项C中的mass后面还要加of才构成正确的短语,选项D接可数名词的单数.