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Being constantly exposed to advertisements is annoying, but it ______ be pleasant sometimes.
A.shallB.needC.canD.must
C

试题分析:考查情态动词:句意:经常看到广告让人恼火,但有时也是令人愉快的。A. shall表示“命令,警告,允诺,征求意见”, B. need需要,C. can能,有可能,会,D. must必须,这里用can表示“有客观可能性”,选C。
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