最常见的后纵隔肿瘤是（）
A.神经节细胞瘤
B.淋巴瘤
C.神经母细胞瘤
D.支气管囊肿
E.转移
参考答案：A
It suddenly _________ to the detective that the millionaire was probably murdered by his own daughter.
A．happened
B．occurred
C．thought
D．took place
大型露天矿的年生产能力为（）万t/年。
