-- You look tired， Miss Green.
--yeah . I     computer games for two hours.
A．playB．was playingC．have been playingD．a(chǎn)m playing
C

試題分析：句意：你看起來很累，格林先生�！堑模乙恢蓖媪藘蓚�小時的電腦游戲。結(jié)合語境可知下文描述的是從過去一直持續(xù)到現(xiàn)在的動作，故用完成進行時態(tài)，選C。
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時態(tài)。
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