问题
选择题
-What's Tom doing?
-He is busy his homework. [ ]
A. doing
B. to do
C. do
D. did
答案
答案：A
搜题请搜索小程序“爱下问搜题”
-What's Tom doing?
-He is busy his homework. [ ]
A. doing
B. to do
C. do
D. did
答案：A