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21 .To climb the mountain is ___ hard work and to go down the mountain is ___ great danger.     A. / ; /       B. a;a       C. a;/       D. /;a   22. The boss _____ company I worked in two years ago has ______ in solving such a kind of problem.    A. whose; much experience   B. who; many experiences    C. whose; many experience   D. which; much experience 23. ____________ of the land in that district __________ covered with trees and grass.    A. Two fifith; is  B. Two fifith; are  C. Two fifths ;is D. Two fifths; are，大小：406 KB