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When Jim's mother saw ___ he had done.she was happy and smil

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When Jim's mother saw ___ he had done.she was happy and smiled
请问这是个什么多句?为什么选B,
When Jim's mother saw ___ he had done.she was happy and smiled.
A:how B:what C:that D:why
这道题是选择动词宾语从句的连词,When Jim's mother saw /___ he had done.“/” 前为主句,后尾从句,从句缺done的宾语,所以用what .he had done what.自己在靠意思理解下,很容易懂.