（英语）从句选择题___________ he discovered in his experiment is very important to the whole world.A.ThatB.WhatC.WhenD.How我选了A请大人分析
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题目内容：
（英语）从句选择题
___________ he discovered in his experiment is very important to the whole world.
A.That
B.What
C.When
D.How
我选了A
请大人分析
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