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Ecotourism is one of the most rapidly growing form of specialized travel in the West，with central American countries，such as Costa Rica，________the principal destinations at present．
Ecotourism is one of the most rapidly growing form of specialized travel in the West，with central American countries，such as Costa Rica，________the principal destinations at present．
A.be
B.to be
C.being
D.been
正确答案是C
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