下列管道分项工程中,属于主要分项工程是()。
A.物料输送管道
B.空气输送管道
C.煤气管道
D.给排水管道
参考答案:C
He had little idea that it was getting so late, _____?
A.didn’t he
B.wasn’t it
C.did he
D.was it?