Accustomed to__the steep mountains,he had no difficulty reaching the top.A.climbing B.having climed 为什么B不可以,我可以理解为他reach前已经爬过这陡峭的山呀.______ the steep mountains,he had no difficulty reaching the top.B．Having accustomed to climbing D．Accustomed to climbing请详细每个答案解释还有不要受上一题影响,本人对非谓语动词菜

Accustomed to__the steep mountains,he had no difficulty reaching the top.
A.climbing B.having climed 为什么B不可以,我可以理解为他reach前已经爬过这陡峭的山呀.
______ the steep mountains,he had no difficulty reaching the top.
B．Having accustomed to climbing D．Accustomed to climbing
请详细每个答案解释还有不要受上一题影响,本人对非谓语动词菜