题目内容
16．Police in Americahave （have） stepped up their search for the missing boy．分析 美国警方加快了他们寻找失踪男孩的步伐．
解答 答案：have
解析：police为集体名词，意为"警察；警方"；一般当作复数使用，故本题中该使用所给词的原形．拓展：step up意为"加快"，而slow down意为"减缓"．
点评 本题考查主谓一致，做此类题目时要先清楚该单词的用法再结合题干确定最终的正确答案．
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