问题描述：
----- 4000 gold ,silver and pottery artifacts were found .
----- When was _____ exactly
----- It was on November 12 ,1990 that the "Nanhai" ship was raised from the seabed .
这个空答案是”it" ,为什么不能填”that"?谁能给我讲讲呀?
----- When was _____ exactly
----- It was on November 12 ,1990 that the "Nanhai" ship was raised from the seabed .
这个空答案是”it" ,为什么不能填”that"?谁能给我讲讲呀?
问题解答：
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