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large quantities of earth ________during the flood in this a

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large quantities of earth ________during the flood in this area 英语单选
a)is washing away b) are washed away
c)has been washed away d)were washed away
large quantities of earth ________during the flood in this a
d)were washed away
large quantities 为复数
during the flood in this area 为过去时
再问: 可是earth 不是单数么
再答: 这里按large quantities来定。 这样的例子很多,如面包bread不可数,但2片面包(2 slices of bread) 就是复数了。