◎ 题干
It’ s suggested by experts that teenagers ____at least 30 minutes exercising, five times a week.
A.spendB.to spendC.spentD.have spent
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It’ s suggested by experts that teenagers ____at least 30 minutes exercising, five times a week.A.spendB.to spendC.spentD.have spent…”主要考查了你对  【虚拟语气】【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。