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?
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?
问题解答：
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