易误填unless或only if
技巧点拨
1.as long as 只要……,充分条件
unless 除非……,必要条件 2.unless一般相当于if...not...
但①如果未出现A就出现B时只用if
I should be shocked if he doesn't cause an accident.
(if...not≠unless)
②(在中学阶段)unless一般不用于虚拟语气
答案 as long as 命题陷阱:as引导的让步状语从句 易错指数☆☆☆☆ 3.Hot ________the night air was, we slept deeply because we were so tired after the long journey.
易误填although 1.I don't believe we've met before,________ I must say you do look familiar.
A.therefore
B.although
C.since
D.unless
答案 B 2.________ I always felt I would pass the exam,I never thought I would get an A.
A.While
B.Once
C.If
D.Until
答案 A 3.________ hard you try,it is difficult to lose weight without cutting down the amount you eat.
A.However
B.Whatever
C.Whichever
D.Whenever
答案 A 4.The little boy won't go to sleep ________ his mother tells him a story.
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