Dr Bethune was busy _____ the wounded soldiers. [ ]A. operating onB. operate on C. operate at D. to operate in -初中英语-n多题

◎ 题干

Dr Bethune was busy _____ the wounded soldiers.

[ ]

A. operating on
B. operate on
C. operate at
D. to operate in

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◎ 解析

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◎ 知识点

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