21.Aids is a kind of dangerous disease.Actions must ___ to stop it from spreading.
A,have been taken B,take C,have taken D,be taken
人气：106 ℃ 时间：2019-08-25 06:39:13
解答
“Aids is a kind of dangerous disease.Actions must_be taken_ to stop it from spreading."
艾滋病是一种危险的疾病.必须采取行动阻止这种疾病的蔓延.
答案选D.因为这是一个被动语态.be+动词过去分词表示被动.
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