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【单选题】
定义如下的类A和组合类B：classA{privateintx;publicinty;}classB{publicAt;publicints;}使用组合类B定义一个对象obj，则下列语句中正确的是（ ）。A.
obj.x = 5; obj.y = 5; obj.s = 5;
B.
obj.t.x = 5; obj.t.y = 5; obj.t.s = 5;
C.
B x = obj; x.y = 5; x.s = 5;
D.
B y = obj; y.t.y = 5; y.s = 5;
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