The doctor told him that ______ was necessary to take the medicine on time.
The doctor told him that ______ was necessary to take the medicine on time.
A. that B. this C. it D. he
【答案】C
【解析】句意：医生告诉他按时吃药是有必要的。
that那，那个；this这，这个；it它；he他，人称代词主格形式。根据句子结构可知，这句话使用了句型it is/was+形容词+to do sth.“做某事是…的”，it是形式主语，真正的主语是动词不定式。故应选C。
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