题目

改错：(2019·江苏高考)Chris and Tim work at a zoo, helping endangering cranes with their reproduction. ________________________________________________________________________ 答案：endangering→endangered　句意：Chris和Tim帮助濒危的白枕鹤繁殖。endangered “濒临灭绝的”；endangering不是形容词，而是动词endanger的现在分词形式。

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