We    on it for several hours but we haven't yet reached any conclusion.
A．a(chǎn)re workingB．workC．have been workedD．have been working
D

試題分析：考查時(shí)態(tài)。for+一段時(shí)間，與完成時(shí)連用，排除A、B；we與work是主謂關(guān)系，不應(yīng)該使用被動(dòng)語(yǔ)態(tài)，排除C；現(xiàn)在完成進(jìn)行時(shí)可以表示動(dòng)作有可能繼續(xù)下去。句意：我們已經(jīng)討論了幾個(gè)小時(shí)，但還沒(méi)有達(dá)成任何結(jié)論。討論有可能繼續(xù)下去，用現(xiàn)在完成進(jìn)行時(shí)較好，故選D。
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