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在书上看到两个句子.1.There'reallkindsofdifficultiestobeovercome.2.TheBBCnewsisusuallynotdifficulttopickup,butit'softentoohardtoundershand.为什么一个是tobeovercome,是被动.另一个是topickup和toundershand

题目详情
在书上看到两个句子.1.There're all kinds of difficulties to be overcome.2.The BBC news is usually not difficult to pick up,but it's often too hard to undershand.为什么一个是to be overcome,是被动.另一个是to pick up和to undershand,不用被动.
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答案和解析
前一句 主语是difficulties 是困难被克服
后一句 not difficult to 是修饰 pick up ,同理too hard to 修饰undershand