问题
选择题
Lucy's mother often _____ her _____ at piano lessons. [ ]
A. drops; by
B. drops; in
C. drops; down
D. drops; off
答案
答案：A
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Lucy's mother often _____ her _____ at piano lessons. [ ]
A. drops; by
B. drops; in
C. drops; down
D. drops; off
答案：A