单项选择题

Modesty helps one go forward ______ conceit makes one lag behind.
A) and C) for
B) because D) while
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Seventy-five percent of the surface of the earth ______ by water. A) are covered C) is covered B) have been covered D) was covered
Seventy-five percent of the surface of the earth ______ by water.
A) are covered C) is covered
B) have been covered D) was covered
单项选择题
In. our hospital, there are altogether 120 ______. A) woman doctors C) womans doctors B) women doctors D) women's doctors
In. our hospital, there are altogether 120 ______.
A) woman doctors C) womans doctors
B) women doctors D) women's doctors
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