When he just got off the plane, he gave us a good description of ____in Spain
问题描述：
When he just got off the plane, he gave us a good description of ____in Spain
A, what he had seen B, that he had seen
C, which he had seen D, he had seen what
选A, 这是个什么从句?
答
A
这里是宾语从句,从句中缺宾语,所以只能用what引导.