have been able to

所屬欄目：英語常見問題解答

【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] >>

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have been able to

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