单项选择题

It is a mystery ______ the prisoner escaped.

A. how
B. what
C. that
D. who
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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
单项选择题
______ is for him to decide.
A. When leaving
B. When shall we leave
C. When we leave
D. When we have left
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