单项选择题

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

A．It turned out
B．why
C．got out
D．had forgotten
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We kept our ______ all night to frighten the wolves.
A．burning fire
B．burnt fire
C．fire burning
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He found ______ everybody know what had happened.
A．it necessary letting
B．it necessary to let
C．necessary letting
D．necessary to let
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