单项选择题

I was hungry, for I ______ nothing all day.

A．ate
B．had eaten
C．am eating
D．have eaten
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单项选择题
I ______ the Summer Palace before, but I decided to visit it a second time.
A．have visited
B．visited
C．hadn't visited
D．had visited
单项选择题
More than ______ years ago, there was a war between the two countries.
A．three thousand
B．three thousands
C．three thousand of
D．three thousands of
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