单项选择题

The reason (why) Jack (failed) to (attend) the lecture is (attend) he had a bad cold.

A．why
B．failed
C．attend
D．attend
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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
单项选择题
We kept our ______ all night to frighten the wolves.
A．burning fire
B．burnt fire
C．fire burning
D．fire burnt
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