I have a lot of homework to do today I cannot go swimming with you.A. becauseB. soC. the

问题补充：

I have a lot of homework to do today, I cannot go swimming with you.

A. because

B. so

C. then

D. But

答案：

A. because

(答案→)B. so

C. then

D. But

解析：本句的含义是我今天有许多的作业要做，导致的结果是我不能和你一起去游泳，根据句意可知，本题的前句表示原因，后句表示结果，表示结果的通常用单词so，故本题选B。