单项选择题

His parents are going on a study trip with a friend of ______.

A. them
B. their
C. themselves
D. theirs
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单项选择题
He invited the three of ______, Bob, Tom and ______.
A. we…me
B. us…I
C. we…I
D. us…me
单项选择题
When I was about to go out, the door opened ______.
A. of itself
B. by itself
C. oneself
D. for itself
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