【正确答案】 D

【答案解析】look at意为“观察”，正合题意。例如：He looked at me with a very peculiar expression．他用一种很怪的表情看着我。而work at作“从事”讲，例如：She had been wondering what she should work at in order to gain her doctorate．她一直思来想去，应该从事什么研究才能取得博士学位。arrive at作“到达”讲，例如：He managed to arrive at the airport in time．他设法及时赶到了机场。