16．This scientist is known _______ on this problem for about ten years．（　　）
A．to workB．to be working
C．to have been workingD．to have been worked

分析 人們知道這位科學(xué)家已經(jīng)研究這個難題差不多有十年了．

解答 答案：C
短語搭配be known to do sth做某事被人了解，被人所熟知；句中for about ten years是表示持續(xù)的時間段，是完成時態(tài)的時間狀語；work on后接賓語，要用主動．故選C．

點評 動詞不等式是非謂語動詞的一種，也是英語中比較活躍的一類結(jié)構(gòu)．通常用來作主語，賓語，表語，定語，狀語等．學(xué)習(xí)時要全面掌握，熟練運用．

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