After a long walk, they______ pass over the mountain.
A. could be able to B.can C. would D.were able to
D.
解析:
辨析be able to 与can ;由语境可知 ： 关键是走了很长的路，表示一段过程不容易
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After a long walk, they______ pass over the mountain.
A. could be able to B.can C. would D.were able to
D.
辨析be able to 与can ;由语境可知 ： 关键是走了很长的路，表示一段过程不容易
