单项选择题

We were told that we should follow the main road（）we reached the central railway station.

A. whenever
B. until
C. while
D. wherever

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单项选择题
How she wishes she（）more attention to her lessons when she was at school!

A. have paid
B. paid
C. had paid
D. has paid
单项选择题
I'll write a letter to（）people are on the list.

A. any
B. all
C. whoever
D. whichever
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