Question

.I won’t call you, __________ something unexpected happens.

A. unless B. whether

C. because      D. while

Answer 1

A。

解析:

unless的意思是“除非”，又如：Don’t call me unless you need help. 除非你需要帮助否则别打电话找我。Unless you change your mind, I won’t be able to help you. 除非你改变你的想法，否则我不能帮助你。