火电厂当栈桥、转运站等运煤建筑设置自动喷水灭火系统或水喷雾灭火系统时,其钢结构也必须采取防火保护措施。()
参考答案:错
The student told me that he _______ the exam _______.
A.has had; yesterday
B.had; the day before yesterday
C.had had; the day before
D.had had; yesterday