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

题干

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

A．why

B．whether

C．when

D．how

上一题下一题 0.4难度单项选择更新时间:2012-05-27 01:35:15

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