have been able to
人文科學(xué)

        【問】No really satisfactory photograph has ever been taken of one in a wild state,no zoologist.however intrepid,has been able to keep the animal under close and constant observation inthe dark jungles in which he lives.(New Concept English,Book 4,P. 17)[原譯1......（本文共 654 字）     [閱讀本文] >>