成人英语三级

单选题 The doctor will not perform the operation __________ it is absolutely necessary．

A．so
B．if
C．for
D．unless

参考答案：D进入在线模考
【参考译文】除非是在非常必要的情况下，否则医生是不会进行手术的。
【答案解析】本题考查连词的使用。前面说医生不会进行手术，后面提到特殊情况(非常必要的时候)，所以只能用unless“除非”，答案选D。

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