While Xiao Ming his homework, his mother came with a cup of tea.( )
A. |
has doing |
B. |
had done |
C. |
is doing |
D. |
was doing |
While Xiao Ming his homework, his mother came with a cup of tea.( )
A. |
has doing |
B. |
had done |
C. |
is doing |
D. |
was doing |