题目内容
-Has Tom finished his homework?
-I don't know.But he ________ it the whole morning.
[ ]
A.did
B.does
C.was doing
D.is doing
答案:C
练习册系列答案
相关题目
题目内容
-Has Tom finished his homework?
-I don't know.But he ________ it the whole morning.
A.did
B.does
C.was doing
D.is doing