答案C,
说明：·1、about 在此句中是介词,介词后面通常不能接不定式,而需接动名词,所以答案A、B可以排除；2,not 否定非谓语动词时,它的位置通常放在非谓语动词之前,having not （错误）,
not having（正确）
he's done it for you,so you needn't worry about () it.
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