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可排除其他选项。
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