单项选择题

She told them where she () her son.

A. has last seen  
B. had last seen 
C. last seen      
D. was last seeing

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单项选择题
There () some mistakes in your composition.

A. have         
B. has       
C. seems to be     
D. seem to be
单项选择题
--I can't see the blackboard very well.--Perhaps you need ()

A. examining your eyes
B. to be examined your eyes
C. to have examined your eyes
D. to have your eyes examined
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