Question

what surprised me a lot was that he didn't know __

what surprised me a lot was that he didn't know ______ the difference between “tell”and “ask”.
A :what B :that C :where D :which
选A难道不行吗？意思就是“……不知道两者的不同是什么……”

Answer 1

选A的话 句子宾语从句缺成分
如选A应是what surprised me a lot was that he didn't know what is the difference between “tell”and “ask”.

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Answer 2

我感觉这题目有问题呢，这一空完全可以不填啊，不缺成分啊he didn't know the difference between “tell”and “ask”.

Answer 3

我也感觉这题目有问题，he didn't know 后面选任何一个答案都必须是个从句才行啊

Answer 4

选A肯定不对。因为what做两个成分。而原句只需要一个成分，所以用which