肺部炎症破坏后发生坏死、出血、机化，钙盐沉着最终导致的结果是（）
A.渗出
B.增殖
C.空洞
D.钙化
E.纤维化
参考答案：D
Was it not until you began to work _______ how much time you had wasted? [ ]
A. that you realized
B. did you realize
C. did you not realize
D. that you didn't realize
为什么单阀不能操纵列车制动？
