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12．The detective inspected the room for fingerprints，wondering if someone ____ the room．（　　）

A．

entered

B．

enters

C．

had entered

D．

has entered

分析偵探查看了房間里的指紋，想知道是否有人曾經進來過．

解答答案：C．
前面主句的謂語動詞用的是一般過去時，由常識可推知，是否有人進入過房間，應該是發生在偵探勘察房間之前的動作，即過去的過去，所以為過去完成時；其中wondering為現在分詞短語作狀語的用法．故選C．

點評本題考查了過去完成時的用法：即表示過去某一時間或動作以前已經發生或完成了的動作，該動作發生的時間通常是在"過去的過去"．

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