问题
选择题
When I went into the hall, I saw a little girl ______ up and down. [ ]
A. to jump
B. jumping
C. jumped
D. jumps
答案
答案:B
When I went into the hall, I saw a little girl ______ up and down. [ ]
A. to jump
B. jumping
C. jumped
D. jumps
答案:B