单项选择题

Seventy-five percent of the surface of the earth ______ by water.
A) are covered C) is covered
B) have been covered D) was covered
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单项选择题
Our sports meeting has been ______ because of the heavy rain. A) protested C) kept B) prevented D) postponed
Our sports meeting has been ______ because of the heavy rain.
A) protested C) kept
B) prevented D) postponed
单项选择题
She expressed the hope ______ we would come and visit her again. A) which C) when B) that D) as
She expressed the hope ______ we would come and visit her again.
A) which C) when
B) that D) as
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