2. 外语
  3. You have failed to pass CET 4 again I think you______harder.

You have failed to pass CET 4 again I think you______harder.

admin2010-02-22  19
问题 You have failed to pass CET 4 again I think you______harder.
选项 A、ought have studied
B、ought to have studied
C、must have studied
D、may have studied
答案B
解析
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