So confused______ that he didn’t know how to start his lecture.

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问题 So confused______ that he didn’t know how to start his lecture.

选项 A、since he became
B、would he become
C、that he became
D、did he become

答案D

解析 本题考查倒装句。在so…that…结构中,如果将so置于句首以示强调,则其后直接接形容词,并形成部分倒装。句子时态为过去式,因此用助动词did来构成倒装。四个选项中只有[D]符合要求,故为答案。
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