--4000 gold ,silver and pottery artifacts were found .
--When was ______exactly?
--It was on December 22nd, 2007 _______ the Nanhai No.1 , the sunken ship ,was raised from the seabed .
A. it , that B. one , when C. that ,that D. it , when
which is right?many english learners in china are unsure to this question,I think american friends would solve it easily
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