--You should have thanked her before you left.--I meant ________, but when I was leaving I couldn’t find her anywhere.
#90799
A
to do
B
to
C
doing
D
doing so
推荐题目
We found the baby  ____ on the floor.      
#95880
A
slept
B
sleep
C
to sleep
D
sleeping
Robert is said _______ abroad, but I don’t know what country he studied in. 
#98633
A
to have studied
B
to study
C
to be studying
D
to have been studying