问题描述：
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1.The teacher_______(go) in to the classroom while the boy ___________(draw) on the blackboard.
2.she__________(break)herankle(踝)while she ________(play)tennis.
3.when my brother_________(come)in to the room,I___________(telephone）Mary.
1.The teacher_______(go) in to the classroom while the boy ___________(draw) on the blackboard.
2.she__________(break)herankle(踝)while she ________(play)tennis.
3.when my brother_________(come)in to the room,I___________(telephone）Mary.
问题解答：
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