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It is reported that in our country cities ________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.
A．sufferingB．sufferC．sufferedD．are suffering
A

試題分析：考查現在分詞做定語：句意：據報道我們國家遭遇嚴重的空氣污染在國家標準以上30%的城市到2030年要努力達到標準。這里是定語修飾cities，cities和suffer heavy air pollution是主動關系，用現在分詞做定語，選A。
點評：當分詞做定語的時候，如果構成分詞的動詞與名詞構成主動關系，就使用現在分詞做定語；當二者構成被動關系，使用過去分詞做定語。單獨的一個分詞做定語要放在名詞的前面，分詞短語做定語要放在分詞的后面。
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