题目内容

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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