I think____it will clear up this afternoon and ___they will come to say good-bye to us.

题目

I think____it will clear up this afternoon and ___they will come to say good-bye to us.
A.that;/ B.that;when
C./;that D.when
话说标准答案我是知道过的,主要是求详解
第一个空为何要省略掉that,第一个都省掉了第二个为啥不省掉

答案

C
第二空,由于也是 I think 的内容、但是跟在And后,所以一定要有一个that做引导,同时表明也是 I think 的内容.
选定 C
一般的,作为think的宾语从句时,第一个从句的that引导词可以省略,而第二个是一定不能省略的.