【題目】We ______ on it for many hours, but we have not yet reached any conclusion. ( )

A.are being workedB.are workingC.have been workingD.have been worked

【答案】C

【解析】

句意：我們已經(jīng)做了很多小時了，但我們還沒有得出任何結論。根據(jù)but后時態(tài)，可以判斷出到現(xiàn)在還沒有得出結論，有可能還要繼續(xù)下去，所以要現(xiàn)在完成進行時。故選C。

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