Listen!There is something unusal _____in the next room.A:happening B:happen C:to happen

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• Listen!There is something unusal _____in the next room.A:happening B:happen C:to happen
• There is something____in the street.A.happen B.happened C.happening D.happens 选什么?原因是：
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• Listen!There is something unusal _____in the next room.A:happening B:happen C:to happen选什么?为什么?
• There is something____in the street.A.happen B.happened C.happening D.happens 选什么?原因是：
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• 分别以△ABC边AC BC做正方形ABFG和ACDE连接GE 若以O为EG的中点 OA的延长线交BC于H探究下列问题（1）S△ABC=S△AEG（2）BC=2AO（3）AH⊥BC（4）连接FD 若M是FD的中点 MN⊥BC于N试探究BC=2
• 别以△ABC的边AB、AC为边,向外作正方形ABFG和ACDE,连接EG,若AH⊥BC,HA的延长线交EG于点O