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By this time tomorrow ,I bet the contract___ A has been prev

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By this time tomorrow ,I bet the contract___ A has been prevented B will have been signed
C is signed D will be signed请说明理由
B
再问: 为什么
再答: 由tomorrow可知时间是将来,再有by后接时间,可知要用完成时,所以综合起来就要用将来完成时
再问: 不好意思啊,答案是D
再答: 我还是认为答案应该是B