Tom usually a bike to school. Look he to school now.A. rides; is ridingB. is riding; is

问题补充：

Tom usually a bike to school. Look, he to school now.

A. rides; is riding

B. is riding; is riding

C. rides; rides

D. is riding; rides

答案：

(答案→)A. rides; is riding

B. is riding; is riding

C. rides; rides

D. is riding; rides

解析：句意：汤姆通常骑自行车去学校。看，他现在正在骑车去学校。根据usually可知本句的时态为一般现在时，Tom为第三人称单数，所以用rides，根据第二句中的Look和后面的时间状语now可知用本句是描述的此时此刻的情景即用现在进行时；故选A。