________ that I was a regular visitor, the servant let me in.
#97711
A
Having seen
B
Seen
C
Seeing
D
To see
推荐题目
Once _____ , the machine will keep running.
#94334
A
start
B
started
C
to start
D
starting
The flowers need ____.
#97809
A
watered
B
to water
C
water
D
watering