单项选择题

They all enjoyed ______ to play the guitar.

A. learning
B. learn
C. to learn
D. learned
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单项选择题
We are studying English hard ______ our country better in the future.
A. serve
B. to serve
C. serving
D. served
单项选择题
The ______ thing would have been not to say anything.
A. skillful.
B. cunning
C. tactful
D. stupid
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