单项选择题

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

A．why
B．failed
C．attend
D．because
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单项选择题
(How) can I convince you (of that) we have almost (Used up) our (supplies)
A．How
B．of that
C．Used up
D．supplies
单项选择题
Yellow stone National Park is (one of) the (older) parks in the U. S. It (was established) (Congress) in 1872.
A．one of
B．older
C．was established
D．Congress
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