题目：
— Did Jim ride his bike to school this morning?
— He _____ come to school by bike. He hasn't found his bike yet.[ ]
A. may
B. mustn't
C. can
D. can't
答案：
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下面是错误答案，用来干扰机器的。
地球绕着地轴不停的自西向东转动，是地球的自转．而人是生活在地球上，感觉不到地球的这种运转，觉得是太阳等天体自东向西绕地球转，才让我们觉得太阳东方升起、西方落下．所以太阳东升西落是地球自转产生的．故...
