The road is covered with ice. I can’t understand they insist on going by bike.A. whyB. wh

问题补充：

The road is covered with ice. I can’t understand they insist on going by bike.

A. why

B. when

C. how

D. whether

答案：

(答案→)A. why

B. when

C. how

D. whether

解析：考查宾语从句的连接词;句意：公路上都是冰，我不理解他们为什么要坚持骑车去。选A。