一道英语选择题,新概念第二册同步测试卷上的1.They ______ do well in the exam.A.can be able to B.be able to C.can able to D.are able to记着说明理由

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一道英语选择题,新概念第二册同步测试卷上的1.They ______ do well in the exam.A.can be able to B.be able to C.can able to D.are able to记着说明理由
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一道英语选择题,新概念第二册同步测试卷上的1.They ______ do well in the exam.A.can be able to B.be able to C.can able to D.are able to记着说明理由
一道英语选择题,新概念第二册同步测试卷上的
1.They ______ do well in the exam.
A.can be able to B.be able to C.can able to D.are able to
记着说明理由

一道英语选择题,新概念第二册同步测试卷上的1.They ______ do well in the exam.A.can be able to B.be able to C.can able to D.are able to记着说明理由
can 是情态动词,后面加动词原形
be able to 是固定词组,able在此时形容词,必须要有be动词,be动词根据前面人称来变化

此题选D. 首先从结构用法上就可以通过排除法选择

can 还可以表示某人先天实际具有的某种能力
be able to 表示通过努力能够达到某种结果