we will have an exam(测试) next week we have to go over our lessons.A. Because /B. Because

问题补充：

we will have an exam(测试) next week, we have to go over our lessons.

A. Because, /

B. Because ,so

C. / , /

D. So, so

答案：

(答案→)A. Because, /

B. Because ,so

C. / , /

D. So, so

解析：句意：因为下周我们将有一个测试，所以我们必须去复习我们的课程。英语中因为，所以不能同时出现在句子中，故选A