4．We    on it for several hours but we haven't yet reached any conclusion．（　　）
A．are workingB．work
C．have been workedD．have been working

分析 我們一直努力了好幾個(gè)小時(shí)，但是至今善未得出任何的結(jié)論．

解答 答案：D．根據(jù)but后的現(xiàn)在完成時(shí)態(tài)，可以判斷出到現(xiàn)在還沒(méi)有得出結(jié)論，有可能還要繼續(xù)下去，所以要現(xiàn)在完成進(jìn)行時(shí)．．C表示現(xiàn)在完成時(shí)的被動(dòng)態(tài)，與題意不符．

點(diǎn)評(píng) 考查現(xiàn)在完成進(jìn)行時(shí)．
reach vt．到達(dá)，達(dá)到，伸出，影響 vi．達(dá)到，延伸，伸出手，傳開(kāi)．
1．reach after 努力謀求，竭力達(dá)到 伸手想抓
2．reach back 回憶，回顧
3．reach for 伸出手去抓
4．reach out 伸手拿[抓]； 伸向前； 追求； 伸出援助之手，提供援助

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