the man didn't know__the thief broke into the house and stole all his valuable things.A.it was when that B.when it was that C.that it was when D.was it when that选哪个,为什么?请各位老师赐教.
问题描述：
the man didn't know__the thief broke into the house and stole all his valuable things.
A.it was when that B.when it was that C.that it was when D.was it when that
选哪个,为什么?请各位老师赐教.
答
B
it在when引导的从句中作形式主语,从句的真正主语是the thief broke into the house and stole all his valuable things,that引导主语从句不能省略
这个句子是一个从句又套一个从句的,when及后面的全部又是作know的宾语从句