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、if
B、unless
C、when
D、as

答案B

解析本题考查状语从句中连接词的选择。选项A和B引导条件状语从句，而选项C和D引导时间状语从句，根据主从句的关系可以判断应该是一个条件状语从句，因此需要从前两个选项中选出正解答案。unless通常表示“if．．．not”，根据题意从句中需要表达“if it is not absolutely necessary”的含义，因此选项B为正确答案。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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The doctor will not perform the operation______it is absolutely necessary.

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普高专升本

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