Because Robert was seen ____ the room, everyone thought he was the thief. 
A. to enter          B.  enter              C. entered
A

試題分析: 句意：因為羅伯特被看到進了房間，所有人認為他是小偷。enter進入；was seen被動語態(tài)，后接不定式要加to,故選A.
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