【題目】Mike ________his computer and checked his email.

A．turned on B．turned off

C．turned up D．turned down

【答案】A

【解析】

試題分析：句意：Mike打開他的電腦，檢查他的電子郵件。turn on打開；turn off關(guān)上；turn up出現(xiàn)，露面；turn down拒絕。根據(jù)句意可知選A。

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