单项选择题

It was in New York ______ I first met Mr. Smith.
A. where B. in which C. which D. that
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单项选择题
They took ______ measures to prevent poisonous gases from escaping.
A. fruitful
B. beneficial
C. sufficient
D. effective
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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