9．No one can walk the wire in the air without a bit of fear unless ______ very young．（　　）
A．having trainedB．trainedC．to be trainedD．being trained

分析 沒有人能在絲毫不恐懼的情況下在空中走鋼絲，除非很小的時候接受過訓練．

解答 答案：B
動詞train與其邏輯主語構成被動關系；用于連詞unless之后，在句中作條件狀語，因此此處在功能上相當于由unless 引導的條件狀語從句：unless he is trained very young．這里省略了"主語+be"部分；故選B

點評 做本題時，應掌握過去分詞作條件狀語時的用法：在功能上相當于if，once或unless等引導的條件狀語從句，在該結構中，可以省略位于連詞與過去分詞之間的主語和系動詞be．

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