单项选择题

Not until the dedication of Yellowstone Park in the late nineteenth century（）a national park.

A. the United States had
B. did the United States have
C. when the United States had
D. the United States having

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单项选择题
I understand （）preparation that staff must put in under pressure to meet the dead-line.

A. more than the enormous amount of
B. better than most the enormous number of
C. better than most the enormous amount of
D. fewer than the number of
单项选择题
The management requests that all personnel（）their complaints to their immediate supervisor.

A. will direct
B. directs
C. directing
D. direct
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