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

正确答案是：

同类题型

tter _____London, May 24th,1898

he researcher collected information,studied it, did a lot of and learntfrom the experiences of farmers.

Mary is _________ primary school student in Beijing.

下列各句中，没有语病的一句是（）

Facing up to your problems ____ running away from them is the best approach to working things out.