when we saw his pale face ,i ( ) what ( )A.realized,had happenedB.was realizing,was happeningC.realized,has happenedDwas realizing,had happened

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when we saw his pale face ,i ( ) what ( )A.realized,had happenedB.was realizing,was happeningC.realized,has happenedDwas realizing,had happened
when we saw his pale face ,i ( ) what ( )
A.realized,had happened
B.was realizing,was happening
C.realized,has happened
Dwas realizing,had happened

when we saw his pale face ,i ( ) what ( )A.realized,had happenedB.was realizing,was happeningC.realized,has happenedDwas realizing,had happened
A
分析:因为四个选项REALIZE都用了过去时,而事情发生是在“意识到”之前,因此要用过去完成时态.此外,我们的语言习惯是说“意识到”,一般不说“正在意识到”,因此选A.

c

A 过去完成时 过去的过去发生的事情
when we saw为过去时
在我们看到之前发生的事情用过去完成时

A