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14．It is said that some heavy-polluting factories in my hometownhave been closed （close） already because of PM2.5in the air．

分析據說在我家鄉的一些重污染工廠，因為空氣PM 2.5，已經被關閉．

解答答案：have been closed
提示詞close，動詞，關閉．根據標志詞already，可知應該用現在完成時態．根據題干可知，句子主語factories是動作的承受著，與動詞close構成被動關系，所以應該用被動語態．現在完成時態的被動語態構成：have/has+been+過去分詞．主語是factories，是復數形式，主謂一致，所以應該用have，故填：have been closed．

點評本題主要考查完成句子，首先要根據所給單詞提示，然后根據句式特點，結合句意和詞性，確定單詞的適當形式，最后把句子補充完整．就本題而言主要考查現在完成時態的被動語態．

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