题目内容
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
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题目内容
| A. could be able to | B.can | C.would | D.were able to |