----- 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?
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----- 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?
----- 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?
----- 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?
这是（when is it today?今天是几号?）一样的道理.
it 可以表示时间,天气,距离等.
It's fine.
It's three miles from here to my home.
答案中的it is/was that when/who是个固定句型，表示一种强调。所以提问时要用it。
it代表上面说的整句话，而that不能代表整句话