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The road is covered with snow. I can’t understand ________ they insist on going by motor-bike.    

A. why                  B. whether               C. when               D. how

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

A. why B. whether?C. when D. how?

The road is covered with snow. I can’t understand ________ they insist on going by motor-bike.    

A. why             B. whether          C. when              D. ho

The road is covered with snow. I can’t understand ________ they insist on going by motor-bike.    

A. why                  B. whether               C. when               D. how

The road is covered with snow. I can't understand ______they insist on going by motor-bike.

A. why                B. whether           C. when           D. how