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My mother is busy____her work.A,at B,with C.in D.from ____fi

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My mother is busy____her work.A,at B,with C.in D.from ____finish at 2:00.Which is wrong?A.Class
1.My mother is busy____her work.A,at B,with C.in D.from 2.____finish at 2:00.Which is wrong?A.Class all B.All the classes C.All of my class D.All classes
1
B be busy with 忙于..某事.
2 A
Class all
class课程是可数的,要用复数.