单选题
She ______ on this essay for twenty minutes but she has written only about a hundred words.
A、
will be working
B、
worked
C、
has been working
D、
will have worked
【正确答案】
C
【答案解析】
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。
提交答案
关闭