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He () in the laboratory the whole morning.
A、has been working
B、is working
C、has worked
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As an () observer my analysis is supposed to be objective.
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有如下程序： #jnCludeiostream using namespaCe std； Class Part{ publiC： Part(int x=0)：val(X){Coutval；} ～Part{Coutval；} private： int val； t }； Class Whole{ publiC： Whole(int x，int Y，int z=0)：p2(x)，pl(y)，val(z){Coutval；} ～Whole{eoutval；} private： Part pl，p2； int val； }； int main { Whole obj(1，2，3)； return 0； } 执行这个程序的输出结果是( )。A.123321B.213312C.213D.123123
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