两道英语单选,并解释.

题目

两道英语单选,并解释.
1、China and united states held their first strategic dialogue on August 1 and __ to increase cooperation and constructive relations.
A.agreed
B.would agree
C.have agreed
D. had agreed
2、It was only when I got home late in the evening that __ what had happened to my brother .
A.I knew
B.I had known
C.did I know
D.had I know

答案

1.A,and并列
2.C,It was only...that...句型要倒装 排除A B “我”是到家的时候才知道发生了什么 而不是回家之前就已经知道 所以选C