2. 外语
  3. She ought to make a shift now; she is in a bad mood because she ______ in the dull work too long.

She ought to make a shift now; she is in a bad mood because she ______ in the dull work too long.

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问题 She ought to make a shift now; she is in a bad mood because she ______ in the dull work too long.
选项 A、had engaged
B、is engaging
C、has been engaging
D、engaged
答案C
解析 时态题。根据句义，这里表达的是，她现在心情不好是过去的动作一直持续到现在的结果，所以用现在完成进行时。
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