when did they go hiking? (last weekend 不能加)
who did clean classroom?(John and Mike不能加)
为你解答。
They went hiking last weekend.（when）
When did they go hiking? 他们何时去远足的？
John and Mike cleaned the classroom（who）
Who cleaned the classroom? 谁打扫了教室？
When did they go hiking?
Who cleaned the classroom?
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