单项选择题

I don't know ______ she bought for mother's birthday.

A. which
B. how
C. what
D. that
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He has two sisters, ______ are working in the city.
A. which
B. who
C. whose
D. whom
单项选择题
It is a mystery ______ the prisoner escaped.
A. how
B. what
C. that
D. who
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