【题目】I need help now! I have to fix a leaking pipe in my bathroom but I’m not sure ______to begin.
A. what B. which
C. where D. when
在线课程【答案】C
【解析】考查疑问词。句意：我现在需要帮助。我不得不修理洗手间里一个正在漏水的管子，但是我不确定从何处着手。代入句子，只有C选项符合语境，是管子哪里漏水，表示地点，故选C。
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