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—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading.
—Don’t worry. You know, sometimes the Internet ________ be very slow.

A.can B.may C.should D.must

A

解析试题分析:考查情态动词。情态动词can表推测,意为“可能”,指理论上的可能性,即这种可能未必发生;may表示的可能性没有can大;should应该;must必须;must表肯定推测,意为“一定”。句意:要知道,有时候,网络会非常慢。故选A。
考点:考查情态动词

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