Police in Americahave stepped up their search for the missing boy．题目和参考答案——青夏教育精英家教网—

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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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