1.It ispretty well understood _C_ controls the flow of carbon dioxide in and out the atmosphere today.
A.that B.when C.what D.how 我想知道为什么不选A还有A和B在主语从句中的区别在翻译一下
2._B_leaves last turns off the light.
A.who B.whoever C.No matter who B.whomever为什么不选c
3._B_is one of the most useful and fascinating divisions of human knowledge is widely accepted.
A.where chemistry B.that chemistry C.what chemistry D.chemistry我选了A
参考资料:英语牛人团团员
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