The doctor will not perform the operation ______ it is absolutely necessary.

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问题 The doctor will not perform the operation ______ it is absolutely necessary.

选项 A、so
B、if
C、for
D、unless

答案D

解析本题考查的是连词辨析。unless是“除非”的意思，符合题目，即医生不会实施手术，除非有绝对的必要。

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成人本科学位英语

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