单项选择题

During the rainy season the Mississippi River may carry away hundreds of acres of valuable topsoil from one area and arbitrarily deposit it in another.

A．subsequently
B．lawfully
C．mercilessly
D．randomly
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单项选择题
The university board of trustees deemed it urgent that a new provost ______ to replace Mr. Dannison who had been diagnosed with cancer.
A．be selected
B．should be selected
C．must be selected
D．was selected
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