Up to now, they _________ a good way to solve that problem. A.didn’t find B.can’t find C
Uptonow,they_________agoodwaytosolvethatproblem.A.didn’tfindB.can’tfindC.hadn’tfoundD...
Up to now, they _________ a good way to solve that problem. A.didn’t find B.can’t find C.hadn’t found D.haven’t found
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