2. 外语
  3. He promised me a letter; he ought to ______ it days ago.

He promised me a letter; he ought to ______ it days ago.

admin2011-05-29  69
问题 He promised me a letter; he ought to ______ it days ago.
选项 A、have written
B、write
C、had written
D、be writing
答案A
解析 ought to have done sth.意为“原本应该做某事(但却没做)”。
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