難度:★ 考點(diǎn):介詞
1. Linda has bought a large house ________ a swimming pool.
A. with B. in C. on D. from
2. I think it's not polite to laugh ______ others.
A. in B. at C. over
3. Practicing in groups is good ______ us to learn English.
A. at B. in C. for
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