高考英语中最常考的八类状语从句

unless的意思是“如果不……”“除非”，对于涉及unless的考题，一般只要能读懂句意，弄清语境，一般不会有问题。如：

1. Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t use a nest. (湖南卷)

A. why                      B. how                       C. unless                     D. where

2. I won’t call you, ______ something unexpected happens. (全国I)

A. unless                    B. whether                  C. because                  D. while

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