9810语法34

icanflyhighlyUID: 2154694

34.（Specially ）bred varieties of( lettuce) can( be grown) in water containing dissolved (nutritious )rather than in soil.
nutritious 是错的，lettuce为什么用单数？be grown？

mwhUID: 201249

lettuce在这里可以这样用，不做单数可数名词；grow在这里的意思是：种植, 栽培, 培育vt.，是所以是被动。

icanflyhighlyUID: 2154694

lettuce为什么可以这样用呢？
谢谢啊：）

mwhUID: 201249

lettuce在托福考试中好像都是作为不可数名词出现的，我给你几个真题中的例子：
6. ____ large amounts of vitamin E found in green leaves, such as lettuce, and in cereals,
especially in wheat germ.
(A) The
(B) They have
(C) There are
(D) Because of
132. Cultivated for salad since ancient times, lettuce is harvesting before its flower stem shoots up to bear its small yellow flowers.

icanflyhighlyUID: 2154694

谢谢啊：）