问题补充：
单选题Thereareseveralfactors_______intheeconomy_______makeitdifficulttopredictthefuture.A.operate; whereB.operating; whichC.to operate; thatD.operated; what
答案：
B
时间：2021-09-27 13:24:35
单选题Thereareseveralfactors_______intheeconomy_______makeitdifficulttopredictthefuture.A.operate; whereB.operating; whichC.to operate; thatD.operated; what
B
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