The student has waited at the entrance for more than half an hour.(划线部分提问,划for more than下

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The student has waited at the entrance for more than half an hour.(划线部分提问,划for more than下
The student has waited at the entrance for more than half an hour.(划线部分提问,划for more than下

The student has waited at the entrance for more than half an hour.(划线部分提问,划for more than下
The student has waited at the entrance for more than half an hour.(划线部分提问,划for more than half an hour
How long have the students waited at the entrance?