what were you doing when the teacher _____the classroomA.entered toB.entered intoC.entersD.entered选什么 为什么

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whatwereyoudoingwhentheteacher_____theclassroomA.enteredtoB.enteredintoC.entersD.entered选什么为什么whatwe

what were you doing when the teacher _____the classroomA.entered toB.entered intoC.entersD.entered选什么 为什么
what were you doing when the teacher _____the classroom
A.entered to
B.entered into
C.enters
D.entered
选什么 为什么

what were you doing when the teacher _____the classroomA.entered toB.entered intoC.entersD.entered选什么 为什么
B.entered into,强调进入的状态