2. 外语
  3. We could not have fulfilled the task in time if it ______ for their help.

We could not have fulfilled the task in time if it ______ for their help.

admin2009-05-28  49
问题 We could not have fulfilled the task in time if it ______  for their help.
选项 A、was not
B、is not
C、had not been
D、has not been
答案C
解析
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