passenger plane crashed near Gazvin Iran and all 168 people onboard were killed.A. A; aB.

问题补充：

passenger plane crashed near Gazvin, Iran and all 168 people onboard were killed.

A. A; a

B. A; /

C. The; the

D. The; a

答案：

A. A; a

(答案→)B. A; /

C. The; the

D. The; a

解析：考查冠词。句意：一架客机在Gazvin, Iran附近坠毁，机上168人全部遇难。结合语境可知前文泛指任何一架客机，下文为固定短语on board，在机上，故用冠词。故选B。