单项选择题

Yellow Stone National Park is (one of) the (older) parks in the U. S. It (was established) by (Congress) in 1872.

A. one of
B. older
C. was established
D. Congress
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单项选择题
(With) a (genuine) Oxford accent, she (could) (pass) as a native English speaker easily.
A. With
B. genuine
C. could
D. pass
单项选择题
Hardly (did he hear) his mother's (calling) (when) he realized that (it was already dark).
A. did he hear
B. calling
C. when
D. it was already dark
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