二、文法測驗【請在下列各題中選出最適當的答案】16. _____ to a tree, there was nothing for the dog to do except bark at passe

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二、文法測驗【請在下列各題中選出最適當的答案】16. _____ to a tree, there was nothing for the dog to do except bark at passersby.
(A) Tie
(B) Tied
(C) Tying
(D) Having tied