单项选择题

Even if you are an experienced teacher, you sometimes（） make some mistakes.

A. can
B. must
C. should
D. will

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单项选择题
I should never have said that. I wish I （） that.

A. didn't say    
B. wouldn't say   
C. hadn't say   
D. don't say
单项选择题
In this park, sparrows often fly down from trees to eat from visitors' hands. They are used to （）in this way.

A. be fed
B. feed
C. having fed
D. being fed
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