---The light was on all night long.

---Yes. It seemed that Mike ________. He was the last one to leave the office.

A．was to be blamed

B．was to blame

C．had been blamed

D．should be blamed

面粉含水量比标准减少1％时，则面包面团搅拌时，配方内水的用量可随着增加（）

A.0

B.2

C.4

D.6%