We are required to write an essay for the course. I（ ）about half of mine so far.
A、
write
B、
have been writing
C、
wrote
D、
have written
【正确答案】：D
【题目解析】：
本题考查的是现在完成时的标志词。
so far为现在完成时态的标志，故选择D选项。
句意：我们被要求写一篇课程论文，我到目前为止已经完成了一半。
We are required to write an essay for the course. I（ ）about half of mine so far.
We are required to write an essay for the course. I（ ）about half of mine so far.
write
have been writing
wrote
have written
本题考查的是现在完成时的标志词。
so far为现在完成时态的标志，故选择D选项。
句意：我们被要求写一篇课程论文，我到目前为止已经完成了一半。