mary,do you know what was__?A happened to him B he doing at that time C Mr.Li's father D his favorite sport
问题描述：
mary,do you know what was__?
A happened to him B he doing at that time C Mr.Li's father D his favorite sport
答
A
答
D
答
这里选A,首先B,D不选,因为这里what引导的是宾语从句,从句里面应该为陈述语序；如果选B或D的话,从句里就不是陈述语序（意思是从句的语序不变）了.
C更不用说了,C为人,前面连接词应为who,这里已经是what了,故C不选!
之所以选A答案,是因为当把A答案代入原句中时这里就变成了mary,do you know what was happened to him.what引导的是宾语从句且what在从句中做主语,was happened to做谓语,him做宾语；
回答完毕,你看可以不,可以的话,请选为满意答案.希望对你有所帮助,请指出!
答
B