单项选择题

I don't swim now, but I ______ when I was a child.

A. used to do
B. used to doing

C. was used to doing
D. was used to do
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单项选择题
Nowhere else in the world ______ more attractive scenery than in Switzerland.
A. you can find
B. you have found

C. can you find
D. has been found
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