She ought to stop working; she has a headache because she too long.A. has been readingB.

问题补充：

She ought to stop working; she has a headache because she too long.

A. has been reading

B. had read

C. is reading

D. read

答案：

(答案→)A. has been reading

B. had read

C. is reading

D. read

解析：从第一句话She ought to stop working 可知“他仍然在学习”，故后面用现在完成进行时态。