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أكمل الفراغ 16

were able / having installed

been / install

were able / had installed

are / were installed

أكمل الفراغ التالي

During the emergency, they ................ to restore electricity with the help of an emergency back-up system that engineering ............... many years earlier.

#pAfter

#faling

#aslep

#staying

#long

#tourists

#were

#badly

أكمل الفراغ 16

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