问题
选择题
— What are the doctors doing?
— They are busy _____ the patients'lives. [ ]
A. save
B. to save
C. saving
D. saved
答案
答案：C
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— What are the doctors doing?
— They are busy _____ the patients'lives. [ ]
A. save
B. to save
C. saving
D. saved
答案：C