【题目】She ought to stop working—she has a headache because shetoo long.
A.has been reading
B.has read
C.is reading
D.read

【答案】A
【解析】本题A、B两项不好区分，这是难点所在。由She ought to stop working可知，她仍然在工作，强调动作对目前的影响并且仍在继续，用现在完成进行时。