Gary goes to the airport  to _____ his wife. She is flying back from Chicago. [ ]

A. take off

B. see off

C. hurry up

D. pick up

点火系电路有故障时，接通点火开关，用启动机带动发动机运转，高压分线的高压火花甚弱或无火，发动机不能发动，表明（）有故障。