应该是名词性从句中连接代词,和连接副词的区别。从句中缺主语、宾语、表语等成分时考虑连接代词，从句为主谓宾完整时用连接副词...
____he said is true.
这个句子中有主语从句，且从句中缺主语，应填上连接代词what.
I want to know ______he told a lie to his teacher.
A、what B、that C、why D . who
这个句子中有宾语从句，从句______he told a lie to his teacher句意完整，只考虑填连接副词 故选C
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