we （were listening to the teacher carefully ）when she came i
we （were listening to the teacher carefully ）when she came in.（就括号部分提问）_ _ you _ when
we （were listening to the teacher carefully ）when she came in.（就括号部分提问）_ _ you _ when she came in?
we （were listening to the teacher carefully ）when she came in.（就括号部分提问）_ _ you _ when she came in?
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