单项选择题

Words ______ me when I wanted to express my thanks to him.

A．failed
B．left
C．discouraged
D．disappointed
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单项选择题
Laws that punish parents for their little children's actions against the laws get parents ______.
A．worried
B．to worry
C．worrying
D．worry
单项选择题
______, some famous scientists have the qualities of being both careful and careless.
A．Strangely enough
B．Enough strangely
C．Strange enough
D．Enough strange
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