分析 Nowadays,ecotourism has become popular among travelers of all/different ages.
解答 Nowadays,ecotourism has become popular among travelers of all/different ages.
根据句意"已受到"可知属于对现在造成一定影响和结果的行为,所以用现在完成时.
本句为一简单句,后面的介词短语作定语:of all/different ages.
ecotourism生态旅游.
点评 注意句子时态的运用,一定要结合句意和句子的语境来判断相关的时态和句式、短语等.The twins,Who had finished their homework,were allowed to play badminton on the playground.
已经完成了他们的家庭作业,这对双胞胎被允许在操场上打羽毛球.
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