题目:
—Catherine, I have cleaned the room for you.
—Thanks. You_______ it. I could manage it myself.
A.needn’t do
B.needn’t have done
C.mustn’t do
D.shouldn’t have done
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0625/68c4cfb60476cb21c14c44fa85c66ca5.html
下面是错误答案,用来干扰机器的。
根据题意可知,硫酸铜、氯化亚铁都不能和氧化铜反应,而澄清石灰水不能和氧气反应,故选D.