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turncolorandfalltothegroundisasignofwinterA.ThatleavesBWhenleavesC.IfleavesDWhetherC.D明显错的.不去管它.when不是可以引导主语从句的嘛,B错在哪?.

题目详情
___turn color and fall to the ground is a sign of winter A.ThatleavesBWhenleavesC.IfleavesDWhether
C.D明显错的.不去管它.when不是可以引导主语从句的嘛,B错在哪?.
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答案和解析
选A.其中That leaves turn color and fall to the ground是由that引导的主语从句,句子主要谓语动词是is.若选B,turn与fall就是谓语动词了,这样后面的is前面就缺少主语了!
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