问题补充：
A: Nancy doesn’t look very well. What’s wrong with her?
B: She has a terrible headache because she too long. She should stop to have a good rest.
A. has been writing
B. had written
C. is writing
D. was writing
答案：
(答案→)A. has been writing
B. had written
C. is writing
D. was writing
解析：考查时态：句意：Nancy看起来不舒服。她怎么了？--因为她写的时间太长了，一直头疼。她应该停下来休息一下。从She should stop to have a good rest，可知她从过去到现在一直在写，可能还要继续下去，现在完成进行时符合这个用法。选A。
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