问题
选择题
---We haven’t been to Hangzhou for ages.
---No, I don’t remember how many years ago _______ I last visited it.
A．it was that
B．was it that
C．it was when
D．was it when
答案
答案：A
考查名词性从句。题中用it was … that …强调结构，强调how many years ago，在宾语从句中用陈述语序，故选A。
2Z(g)+W(s)，△H<0的反应过程。若使b曲线变为a曲线，可采用的措施是