a language requires time and effort.
#95764
A
Learn
B
Learning
C
To learn
D
Being learned
推荐题目
Look around when _____ the street. 
#98251
A
across
B
crossing
C
crossed
D
to be crossing
Don’t leave the water ________ while you brush your teeth. 
#94420
A
run
B
running
C
being run
D
to run
It seems you need to apologize quickly ______ a good friend. 
#95570
A
avoiding to lose
B
to avoid losing
C
avoiding losing
D
to avoid to lose