问题
选择题
Because Robert was seen ____ the room, everyone thought he was the thief.
A. to enter B. enter C. entered
答案
答案：A
题目分析: 句意：因为罗伯特被看到进了房间，所有人认为他是小偷。enter进入；was seen被动语态，后接不定式要加to,故选A.
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