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?yàn)榱_伯特被看到進(jìn)了房間，所有人認(rèn)為他是小偷。enter進(jìn)入；was seen被動(dòng)語態(tài)，后接不定式要加to,故選A.
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