It was playing computer games______ cost the boy plenty of time_____ he ought to have spent doing his homework.

A．that; that

B．which; that

C．which; when

D．that; when

既是长江航道上江海联运港口，又是南北铁路干线上的城市，自西向东依次排列为[ ]

A．重庆、武汉、上海、南京

B．重庆、武汉、南京、九江

C．重庆、九江、芜湖、上海

D．重庆、武汉、南京、上海