He is a good student except___he is sometimes careless.空处为什么填that而不填which,except不是介词吗

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He is a good student except___he is sometimes careless.空处为什么填that而不填which,except不是介词吗
He is a good student except___he is sometimes careless.空处为什么填that而不填which,except不是介词吗

He is a good student except___he is sometimes careless.空处为什么填that而不填which,except不是介词吗
except是介词,但此处需要一个宾语从句的引导词,而which是用来引导定语从句的.