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—Could I surf the Internet for twenty more minutes, Mum?
—Oh, dear, if you________.

A.mustB.canC.mayD.should

A

解析试题分析:句意:--妈妈我可以多上20分钟的网吗?--哦,亲爱的,如果你偏要的话。Must“必须,偏要”,符合句意,can“能够,可以”,may“可能,可以”,should“应该”,选A。
考点:考查情态动词

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