The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.
#88827
A
to be staring
B
stared
C
having stared
D
staring
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