题目内容：

Trees are very important.We can't cut thenm down B cut it down C cut down them
D cut down it

优质解答

选a,tree是树,树不止一颗,所以用them,down是介词,所以这是介词短语,them是代词,英语语法规定代次只能夹在他们中间,如果换成trees就在中间或后面都行啦,

追问：

你说我给谁呢？有四条回答 ！都是A

追答：

恩