单项选择题

Both Pingping and Beibei have done ______ homework.

A. his
B. her
C. their
D. both's
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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
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
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