Ecotourism is one of the most rapidly growing form of specialize
分类: 英语科技文选(00836)发布时间: 2024-08-31 01:42浏览量: 2
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】：C