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—It smells terrible. What has happened here?
—Look, there is a chemical factory_____ much waste gas.
A. pour        B. pouring      C. poured  
B

試題分析：句意：好難聞，這里發(fā)生了什么？看，有一個化工廠正在傾倒大量的廢氣。根據(jù)語境正在傾倒廢氣，所以用現(xiàn)在進行時態(tài)，故選B
點評：動詞的時態(tài)是學習英語過程中非常重要的知識。而很多的題目，必須通過上文的語境判斷得知時態(tài)。現(xiàn)在進行時表示動詞在某個點時間正在進行，本題不難，平時加強記憶，理解即可。
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