10.I didn’t know what __________ to her last night.A.was happened B.happening C.happened D.was happen

10.I didn’t know what __________ to her last night.A.was happened B.happening C.happened D.was happen
10.I didn’t know what __________ to her last night.
A.was happened B.happening C.happened D.was happen

10.I didn’t know what __________ to her last night.A.was happened B.happening C.happened D.was happen
C. happened

c
happen没有被动情况 再加上last night 这个时间状语决定了用过去式这个时态
望采纳！！！！

选C happened
我不知道她昨晚发生了什麽事.
what happened to her last night作know的宾语，是宾语从句。而且what在从句中做主语，正好缺谓语动词happened