单项选择题

It turned out why the tiger got out of the cage because the man in charge had forgot to lock it.

A．It turned out
B．why
C．got out
D．forgot
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单项选择题
The book was so bored that I returned it to the library without finishing it.
A．so bored
B．returned it
C．to the library
D．without finishing
单项选择题
He didn't ______ and so he failed the examination.
A．work enough hard
B．work hard enough
C．hard work enough
D．hard enough work
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