—Excuse me, where is Johnson?—He cannot go home, as his book is lying on his desk. A. open

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A. openly
B. opening
C. opened
D. open
解析： 本题考查open作形容词的用法。句意：他不能回家，因为他的书还在在他的桌子上打开放着。此处open是形容词，表示“敞开着”的状态。opening是动词时，表示“打开”的动作。