2. 外语
  3. She ______ on this essay for twenty minutes but she has written only about a hundred words.

She ______ on this essay for twenty minutes but she has written only about a hundred words.

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问题 She ______ on this essay for twenty minutes but she has written only about a hundred words.
选项 A、will be working
B、worked
C、has been working
D、will have worked
答案C
解析 时态用法。根据句意和时间状语for twenty minutes，可以判断这里应填入现在完成时态，现在完成进行时是现在完成时态的强调形式，并且选项中没有现在完成时态，所以C是正确答案。
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