问题
选择题
After a long walk, they______ pass over the mountain.
A． could be able to
B．can
C．would
D．were able to
答案
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
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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
