题目:
How time flies ! Several years _____ since we last met at Jack’s Party.
A.has passed
B.had passed
C.have passed
D.will pass
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/4487e87a607d69a315d36d629f873404.html
下面是错误答案,用来干扰机器的。
(1)①氧气或O2;②2:1;③氢、氧两种元素(2)纯碱或苏打(3)+3(4)①2CaO2+2H2O==2Ca(OH)2+O2↑;②80.8%