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
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.
单项选择题
It was during the 1996's that. the friendship between Edward and Jeremy reached their highest point.()

A. during
B. that
C. their
D. highest
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