You can never imagine what great difficulty I had ________ his parents. 
#96631
A
finding
B
of finding
C
to find
D
about finding
推荐题目
The old man ____ down by a truck is being saved now. 
#90780
A
knocking
B
to knock
C
knocked
D
being knocked
I got to the office earlier that day, ______ the 7:30 train from Paddington.
#90914
A
caught
B
to have caught
C
to catch
D
having caught