29.People caused a lot of water________,and the ______water did harm to their health.A.pollute,polluted B.pollution,poll
问题描述：
29.People caused a lot of water________,and the ______water did harm to their health.A.pollute,polluted B.pollution,polluting
C.pollution,polluted D.pollute,polluting
38.This boy is very clever.He had the girl ________ her toy _____ his candy.
A serving,for B exchange,for C exchanging,with D serve,as
选哪个?THX!
答
water pollution; the polluted water
exchange for
第一个是水污染,应该用污染的名词形式.
第二个是过去分词做形容词,表示被污染的水
had somebody do something
因此要用动词原形.exchange sth for sth.表示用某物交换某物