The World Wide Web is sometimes jokingly called the World Wide Wait because it ________ be very slow.   
A．shouldB．mustC．willD．can
D
考查情況動詞。can可以表示一種客觀存在的可能性，但不一定就會發(fā)生。A應(yīng)該；B必定，必須；C將；句意：….因為它有可能會很慢。
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