the stydents are doing ()homework.a :your b :their c:theirs

the stydents are doing ()homework.a :your b :their c:theirs
the stydents are doing ()homework.a :your b :their c:theirs

the stydents are doing ()homework.a :your b :their c:theirs
their

b :their

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B。homework是名词，需要形容词性的物主代词修饰，theirs是名词性的物主代词