问题
选择题
He usually sends postcards to his friend. [ ]
A. a lot
B. lot of
C. a lot of
D. a lots
答案
答案：C
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He usually sends postcards to his friend. [ ]
A. a lot
B. lot of
C. a lot of
D. a lots
答案：C
，正电荷
，正电荷
，负电荷
，负电荷