struct grade{int usualGrade; //平时成绩int finalGrade; //期末成绩};以下关于结构体数组的初始化正确的是_____
A. struct grade myGrade[2]={91,82,93}; 将给myGrade[0]的两个成员和myGrade[1]的第一个成员赋初值
B. struct grade myGrade[2]={91,82,,93};将给myGrade[0]的两个成员和myGrade[1]的第二个成员赋初值
C. struct grade myGrade[2]={91,93};和struct grade myGrade[2]={{91},{93}}; 是等价的
D. struct grade myGrade[]={{}, {}, {}}; 该语句初值列表为空,属于语法错误