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all ( ) can be done must be done.A.that B.which C.who D./如题,说明理由

分类: 作业答案 • 2022-05-16 19:23:53

问题描述：

all ( ) can be done must be done.
A.that B.which C.who D./
如题,说明理由

答

A.
all that＝what.