When he _____(come) to China two years ago he found people didn't understand

问题描述:

When he _____(come) to China two years ago he found people didn't understand
him at all though he ________(learn) some Chinese in his own country.
came had learned
为什么这样填?

尽管他在他的国家学了一些中文.但当他两年前来到中国时,他发现人们还是不能完全理解他.
两年前来中国,two years ago 是过去时,所以用came表过去.
他在他的国家已经学习了一些中文,是在他两年前来中国的时候就已经学了的是过去的过去,所以用完成时,had learned