单项选择题

（） what you intended, I should not have wasted my time trying to explain matters to you.

A. If I realized             
B. Did I realized
C. Were I realized            
D. Had I realized

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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
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
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