【单项选择题】
()the concert had begun did we realize what a splendid show it was going to be.
A、A.No sooner
B、B.Only after
C、C.Hardly
D、D.Scarcely
A、A.No sooner
B、B.Only after
C、C.Hardly
D、D.Scarcely
A、the bearing had been overheated B、water was present in the oil C、the lube oil was not being properly filtered D、the maximum allowable bearing pressure had been exceeded