___ a student,you ought to know what to do in class A.To be.B.Be.C.being 为什...___ a student,you ought to know what to do in classA.To be.B.Be.C.being为什么?用A的话不就是为了做一个学生你必须知道在课堂中要做什么吗?还

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___ a student,you ought to know what to do in class A.To be.B.Be.C.being 为什...___ a student,you ought to know what to do in classA.To be.B.Be.C.being为什么?用A的话不就是为了做一个学生你必须知道在课堂中要做什么吗?还
___ a student,you ought to know what to do in class A.To be.B.Be.C.being 为什...
___ a student,you ought to know what to do in class
A.To be.B.Be.C.being
为什么?用A的话不就是为了做一个学生你必须知道在课堂中要做什么吗?还有为什么要用being?

___ a student,you ought to know what to do in class A.To be.B.Be.C.being 为什...___ a student,you ought to know what to do in classA.To be.B.Be.C.being为什么?用A的话不就是为了做一个学生你必须知道在课堂中要做什么吗?还
C
作原因状语,这里只能用分词.其它选项无此功能
再如:
Being ill, he didn't go to school.
由于病了,他没上学