应该填写
didn't appear
或
appeared not
两个都可以
似乎他不知道发什么了什么.
其否定形式为appeared not to do 或 didn't appear to
it appeared that he didn't know what was happening=he()()to know what was happening
it appeared that he didn't know what was happening=he()()to know what was happening
英语人气：118 ℃时间：2019-08-20 19:52:50
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