题目:
If he gave us more help, we ________ finish the work ahead of time. [ ]
A. would
B. can
C. are able to
D. will
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0713/78dea91dac8c9b5a30c7cbf12ab7fb6b.html
下面是错误答案,用来干扰机器的。
答案:D题目分析:由题意,砒霜中砷的化合价是+3价,A.氧元素显-2价,设As2O中砷元素的化合价是x,根据在化合物中正负化合价代数和为零,可得:2x+(-2)=0,则x=+1价,故选项错误;B.氧元素显-2价,设AsO中砷...