问题补充：
单选题____hasbeenmentionedabove,continuedchairmanafterhetookasipofcoffee,_____theprojectmustbecarriedoutbeforespringfloodcomes.A.As; thatB.That; whichC.This; whichD.It; that
答案：
A解析A“__ has been mentioned above”是定语从句，而“____ the project must be carried out before spring flood comes.”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
