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

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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

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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