单项选择题

He has two sisters, ______ are working in the city.

A. which
B. who
C. whose
D. whom
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It is a mystery ______ the prisoner escaped.
A. how
B. what
C. that
D. who
单项选择题
You may take ______ train you like to, but be sure to get there before Friday.
A. whichever
B. however
C. Whenever
D. wherever
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