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

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单项选择题

You should make your views () to everybody.

A.known
B.know
C.to know
D.knowing

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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