Treesaregoodforman．Wecan'tplantthem________many．A.soB.suchC.tooD.enoug

问题补充：

Trees are good for man．We can't plant them ________ many．A.soB.suchC.tooD.enough

答案：

C解析can't/couldn't…too…为固定搭配，表示“越……越好……”。又因tree为可数名词，所以用too many。