the young man after what seemed half an hour…… 英语单选

问题描述:

the young man after what seemed half an hour…… 英语单选
The young man went into the cinema and after__seemed half an hour ,the girl finally came.
Athat Bit Cwhat Dwhic
为什么不能选B it?

选C.what seemed half an hour做after的宾语,但从句中缺少主语
what指代不确定的一段时间(即which is seemed half an hour)