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。
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