The road is covered with snow.I Can’t understand they insist on going by motorbike.A. w

问题补充：

The road is covered with snow.I Can’t understand they insist on going by motorbike.

A. why

B. whether

C. when

D. how

答案：

(答案→)A. why

B. whether

C. when

D. how

解析：本题考查宾语从句的引导词。根据语句的意义，选A项比较恰当。句意为“路面上满是雪，我不明白他们为什么坚持骑摩托车呢”。