Before the tourists set off , they spent much time setting a limit _____ the expenses of the trip.A.inB.forC.toD.about
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In modern society, alternative energies __________ tradition..
In modern society, alternative energies __________ traditional ones are playing an important role in our daily life. That’s just because scientists have made great breakthroughs _________ the development of science and technology.A.for, duringB.of, during