Have you realized the difficulty we have ____ the problem?
#96909
A
worked out
B
to work out
C
work out
D
working out
推荐题目
_____ from the top of the tower, the south foot of the mountain is a sea of trees.
#93871
A
seen
B
seeing
C
Having seen
D
To see
Storm chasing is so dangerous that some chasers are often hurt in accidents ______ by driving in a heavy rain.
#95917
A
having caused
B
caused
C
to be caused
D
causing
In April, thousands of holidaymakers remained ________ abroad due to the volcanic ash cloud.
#94793
A
sticking
B
stuck
C
to be stuck
D
to have stuck
Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.
#97172
A
facing
B
faced
C
being faced
D
having faced
When it comes to____his classmates with the homework, he never feels tired.
#94598
A
help
B
helping
C
give help
D
offer help