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The troops marched quietly into the village __________ alert the enemies.
A、not as to
B、so that
C、so as not to
D、in order to
【正确答案】：C
【题目解析】：后面接的不是句子，排除B项，题意是，为了不使敌人警觉，所以D项排除，not否定词应放在to前面，所以选C项。