79 下列C++程式中,那一行程式敘述會產生編譯時的錯誤(compile-time error)?

(A)a1.x = 7;
(B)b1.y = 8;
(C)b1.z = 9;
(D)b2 = b1;

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統計: A(2), B(8), C(4), D(6), E(0) #924147