题干
His father ________ for a week.
A：died
B：will die
C：has been died
D：has been dead
答案(点此获取答案解析）
C
A：died
B：will die
C：has been died
D：has been dead
行：①把贝壳制成石灰乳；②在引入的海水中加入石灰乳，沉降、过滤、洗涤沉淀物；③将沉淀物与盐酸反应，结晶过滤、在HCl气体氛围中干燥产物；④将得到的产物熔融电解得到镁。下列说法不正确的是