Johnson______the problem in his mind for two more days before he came to a conclusion.

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问题 Johnson______the problem in his mind for two more days before he came to a conclusion.

选项 A、turned on
B、turned over
C、turned out
D、turned to

答案B

解析 本题考查动词短语辨析。turn on意为“打开(电器、煤气等),接通”;turn over意为“翻身,翻转;仔细考虑”。turn over the problem in one’s mind意为“仔细考虑问题”,故答案为[B]项。turn out意为“结果是,证明是;到场,出席”。turn to意为“翻到;转向;变成;求助于,求教于”。
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