2. 外语
  3. It took five years before they had steady jobs and could be able to send for me.

It took five years before they had steady jobs and could be able to send for me.

admin2011-07-28  54
问题 It took five years before they had steady jobs and could be able to send for me.
选项
答案could be——were
解析 could／can不能与be able to搭配使用。可以和其搭配的情态动词有may，ought to，should。
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