题目内容

Please _________ because this is a reading room.  
A．quietB．to be quietC．to quietD．be quiet
D
本题是考查祈使句的肯定形式。本题的含义为请保持安静，因为这是阅览室。祈使句使用动词原形开头，表示状态使用动词原形be，be动词后跟形容词quiet，故本题选D。
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