John began to do his homework as he

问题补充：

John began to do his homework as he

答案：

选b,reached!

home是副词,前面不加介词!

======以下答案可供参考======

供参考答案1:

B供参考答案2:

b供参考答案3:

B供参考答案4:

BC项改为got,A项改为came就对了

供参考答案5:

Bhome 是副词，前面不可以加 to

供参考答案6:

B