____ has been mentioned above, continued chairman after he took a sip of coffee, _____ the project must be carried out before spring flood es.A.As; thatB.That; whichC.This; whichD.It; that
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A解析A“__ has been mentioned above”是定语从句，而“____ the project must be carried out before spring flood es.”是动词continued的宾语从句，宾语从句中句意和结构都完整，故选that，结合第一个空，得