The doctor will not perform the operation __________ it is absolutely necessary.
The doctor will not perform the operation __________ it is absolutely necessary.
A、so
B、if
C、for
D、unless
【正确答案】：D
【题目解析】：医生不会动手术,除非是绝对必要的。A 因此 B 如果 C 因为 D 除非
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