Today Tom goes to school earlier than

问题补充：

Today Tom goes to school earlier than

答案：

Today Tom goes to school earlier than B:usual

因为than对比的是Today 和usual平常

======以下答案可供参考======

供参考答案1:

我也想知道……我觉得选B

供参考答案2:

than usual 比通常早些