The road is covered with snow. I can’t u
题型:选择题
问题:
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