问题
选择题
Peter is busy _____ at school, but he never forgets _____ exercise every day. [ ]
A. working; doing
B. working; to do
C. at work; doing
D. worked; doing
答案
答案：B
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Peter is busy _____ at school, but he never forgets _____ exercise every day. [ ]
A. working; doing
B. working; to do
C. at work; doing
D. worked; doing
答案：B