he has been writing the composition the whole morning and he still is

问题描述:

he has been writing the composition the whole morning and he still is
he has been writing the composition the whole morning and he still __________,A has been B does C has D is 答案为何选D呢?

句子的意思是:他整个早上都在写作文,他现在仍然在写.既然他现在仍在写,那么就应该用现在进行时啦.
这里he still is省略了后面的writing the composition.
^^