Thetreatmentwillcontinueuntilthepatientreachesthepoint

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The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.

A. when B. where C. which D. whose

B. 因为表示“阶段、程度、地步”的the point在定语从句中作地点状语，所以用where引导定语从句。