16.Police in Americahave (have) stepped up their search for the missing boy.

分析 美國警方加快了他們尋找失蹤男孩的步伐.

解答 答案:have
解析:police為集體名詞,意為"警察;警方";一般當(dāng)作復(fù)數(shù)使用,故本題中該使用所給詞的原形.拓展:step up意為"加快",而slow down意為"減緩".

點評 本題考查主謂一致,做此類題目時要先清楚該單詞的用法再結(jié)合題干確定最終的正確答案.

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