题目内容
In order _______ well, this exercise must be taught again and again.
A. to do B. doing it C. to be done D. to do it
C
考查主语一致时状语从句的省略。主句的主语this exercise与选项中的do之间是被动关系，in order to do是固定搭配，因此选C。
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题目内容
In order _______ well, this exercise must be taught again and again.
A. to do B. doing it C. to be done D. to do it
C
考查主语一致时状语从句的省略。主句的主语this exercise与选项中的do之间是被动关系，in order to do是固定搭配，因此选C。