1.---all the inventions have in common is ----they have succeeded.A.what waht B.that that C.waht thatD.that what2.Why don't you bring ---to his attention that you are too busy to do it?A.that B.what C.that D.it

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1.---all the inventions have in common is ----they have succeeded.A.what waht B.that that C.waht thatD.that what2.Why don't you bring ---to his attention that you are too busy to do it?A.that B.what C.that D.it
1.---all the inventions have in common is ----they have succeeded.
A.what waht
B.that that
C.waht that
D.that what
2.Why don't you bring ---to his attention that you are too busy to do it?
A.that
B.what
C.that
D.it

1.---all the inventions have in common is ----they have succeeded.A.what waht B.that that C.waht thatD.that what2.Why don't you bring ---to his attention that you are too busy to do it?A.that B.what C.that D.it
http://zhidao.baidu.com/question/70469259.html?si=1 这里解释得很好

1. C what that
2. D it

C what指代they have succeeded,做主语.that引导后面的从句.
D it 指代that后面的句子,即:you are too busy to do it.

c
d