英语 (19 21:5:50)
问题描述：
英语 (19 21:5:50)
I think the boy＿＿＿＿ already_______ his homework.
A.does; do
B.did; do
C.is; doing
D.has; done
选什么?
答
选D
already,yet多数都用在完成时中
因为是I think所以从句用现在完成时