"s____ school" 中应该填写 "at"，完整的句子是 "at school"。例如：
1. I go to school every day.
2. She is studying at the school library.
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"s____ school" 中应该填写 "at"，完整的句子是 "at school"。例如：
1. I go to school every day.
2. She is studying at the school library.