题目内容：

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

优质解答

d)were washed away
large quantities 为复数
during the flood in this area 为过去时

追问：

可是earth 不是单数么

追答：

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。