问题
选择题
Many people like Xiao Shenyang because he often makes people _______ happily.[ ]
A. laughing
B. to laugh
C. laugh
D. laughs
答案
答案：C
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Many people like Xiao Shenyang because he often makes people _______ happily.[ ]
A. laughing
B. to laugh
C. laugh
D. laughs
答案：C
，正电荷
，正电荷
，负电荷
，负电荷