.I won’t call you, __________ something unexpected happens.
A．unlessB．whether
C．becauseD．while
A。
unless的意思是“除非”，又如：Don’t call me unless you need help. 除非你需要幫助否則別打電話找我。Unless you change your mind, I won’t be able to help you. 除非你改變你的想法，否則我不能幫助你。
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