I have no idea( )the city.
考试：
科目：（在线考试）
问题：
A：to leave
B：have left
C：when to leave
D：being left
答案：
解析：
【解析】“特殊疑问词+to do"是复合不定式，相当于名词性从句的省略，本题中when to do即是复合不定式，when to leave the city = when I shall leave the city,在句中做idea的同位语，对其内容做解释说明，故答案选C。
A和D代入题干，语义不完整，不能对前面的idea做充分解释；B项是谓语动词形式，显然与前面的谓语动词have有冲突，因为一个句子只能有一个“谓语”。
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I have no idea( )the city.
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