题目内容
15．Some complain that visitors arecausingtoo much stress on the environment．（cause）分析 游客太多的抱怨引起了环境的太大压力．
解答 答案：causing．
通过分析句子结构可知，空格前面是系动词are，给出的单词是一个动词，所以我们要考虑使用现在进行时来填空，所以这个句子的意思是"游客太多的抱怨引起了环境的太大压力．"结合给出的单词提示，故填causing．
点评 首先要掌握句子的意思，然后结合具体的题目以及给出的单词提示，就可以确定正确答案．
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