She ought to stop work: she has a headache because she______ too long.

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问题 She ought to stop work: she has a headache because she______ too long.

选项 A、has been reading
B、had read
C、is reading
D、read

答案A

解析 根据主句时态为一般现在时,再根据时间状语"too long"可排除B、C、D三项。因此A项为正确答案。
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