It’s a difficult skill to master, but ______, it will benefit you for the rest of your life. 
#90000
A
once obtained
B
when to obtain
C
after obtaining
D
while obtaining
推荐题目
 ______ playing computer games, Tom can’t help spending much time surfing the Internet.
#97314
A
Addicting to
B
Addicted to
C
Having addicted to
D
To addict to
It rained nonstop for ten days , completely _____ our holiday. 
#98169
A
to ruin
B
ruined
C
having ruined
D
ruining
He felt his chair ___ at the time of earthquake.
#98786
A
moved
B
to move
C
is moving
D
moving
Mary’s parents objected to _______ John, who was poor and lazy.     
#95864
A
er marrying
B
r marry
C
e married   
D
rry