Certainly I posted your letter — I remember ______ it. 
#98425
A
posting
B
to post
C
to be posting
D
have posted
推荐题目
The missing boys were last seen _______ near the river.
#90108
A
to play
B
to be playing
C
play
D
Playing
_____their students, the famous teacher came into the hall.
#97550
A
Followed
B
Followed by
C
Being followed
D
Having been followed
_____herself wondering whether she had made a mistake, she felt embarrassed and at a loss.
#98715
A
Catching
B
Caught
C
Being caught
D
Having been caught