The teacher asked us in deep waterA. don’t swimB. not swimC. not swimmingD. not to swim

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A. don’t swim
B. not swim
C. not swimming
(答案→)D. not to swim
解析：考查固定搭配以及不定式的否定式。固定搭配ask sb to do sth要求某人做某事；不定式的否定式是在不定式前面直接加not。句意：老师要求我们不要到深水区去游泳。故D正确。