一ThisreturnedChinesescholarhasbecomeoneofthetopexpertsi...

問題詳情：

一This returned Chinese scholar has become one of the top experts in this field.

―Yes，I know him very well ,He      in Africa with animals for ten years．

    A has worked        B、had worked      C．has been working     D．worked

【回答】

知識點：一般過去時及其被動式

題型：選擇題