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
Joe had many regrets when he ______ the years he spent abroad.
A. looked back on
B. looked down upon
C. looked up to
D. looked out of
单项选择题
This is the tallest building that ______ in this city.
A) is ever built

C) has ever been built
B) was ever built

D) has ever built
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