单项选择题

The (scientific) revolution of the early 1900s (affected) education by (change) the nature of (technology).（）

A.scientific
B.affected
C.change
D.technology

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单项选择题
The young parrot (is) totally (dependence) on (parental) care after (hatching).（）

A.is
B.dependence
C.parental
D.hatching
单项选择题
It could have saved me some trouble （） about it.

A．had I known
B．I had known
C．did I know
D．I knew
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