Someproblems________inhisreportare

发布时间：2020-07-27 09:24:18

Some problems ________ in his report are very popular in our school, such as the waste of electricity, water and food, etc.A.referringB.referred toC.referring toD.to refer

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B解析refer to“谈到”，problem是它的承受者，用其过去分词形式作定语。
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