请教单选No.I don’t know the person who wrote it.There must be some _.--Is this letter yours?--No.I don’t know the person who wrote it.There must be some _.A.trouble\x05\x05B.development\x05C.mistake\x05 D.solution

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$请教单选No.I don’t know the person who wrote it.There must be some _________.--Is this letter yours?--No.I don’t know the person who wrote it.There must be some _________.A.trouble\x05\x05B.development\x05C.mistake\x05 D.solution$

请教单选No.I don’t know the person who wrote it.There must be some _________.--Is this letter yours?--No.I don’t know the person who wrote it.There must be some _________.A.trouble\x05\x05B.development\x05C.mistake\x05 D.solution
请教单选No.I don’t know the person who wrote it.There must be some _________.
--Is this letter yours?
--No.I don’t know the person who wrote it.There must be some _________.
A.trouble\x05\x05B.development\x05C.mistake\x05 D.solution