问题
选择题
—Has William finished writing his graduation paper yet?
—I don’t know exactly，but he __________all day.
A．is writing
B．has been writing
C．was writing
D．wrote
答案
B
表示“一整天都在做某事(此时该动作还没有结束)”要用现在完成进行时。
搜题请搜索小程序“爱下问搜题”