She offered to give me a lift, but I         my bike, so I went to the cinema alone.

A．had ridden

B．have ridden

C．will

D．was riding

发动机配平螺钉位于以下发动机的哪个部件上？（）

A.发动机整流锥前锥

B.发动机整流锥后锥

C.发动机风扇盘

D.发动机保持法兰盘