问题描述：
—That must have been a lot of work.—Yeah,it us
—That must have been a lot of work.
—Yeah,it us three days to finish it.
A．takesB．had takenC．tookD．was taking
—That must have been a lot of work.
—Yeah,it us three days to finish it.
A．takesB．had takenC．tookD．was taking
问题解答：
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