They didn't know ( ) with the machine.A what is the matter.B what the matter isC what was the matter.D what the matter was

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Theydidn''tknow()withthemachine.Awhatisthematter.BwhatthematterisCwhatwasthematter.DwhatthematterwasT

They didn't know ( ) with the machine.A what is the matter.B what the matter isC what was the matter.D what the matter was
They didn't know ( ) with the machine.A what is the matter.B what the matter is
C what was the matter.D what the matter was

They didn't know ( ) with the machine.A what is the matter.B what the matter isC what was the matter.D what the matter was
D 宾语从句仍用一般句式,不要倒装