21) ____ on a clear day, far from the city crowds, the mountains give him a sense of infinite peace. A) If walking B) While walking C) Walking D) When one is walking为什么不能选Ｂ
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本句的主语是Mountain，如果前面用现在分词作状语修饰的话，While后动作的发生者是Mountain而不是he.本题答案应该选D
21) ____ on a clear day, far from the city crowds, the mountains give him a sense of infinite peace. A) If walking B) While walking C) Walking D) When one is walking为什么不能选Ｂ
本句的主语是Mountain，如果前面用现在分词作状语修饰的话，While后动作的发生者是Mountain而不是he.本题答案应该选D