________ the difficult maths problem, I have consulted Professor Russell several times.
#88373
A
Working out
B
Worked out
C
To work out
D
Work out
推荐题目
______ a family of chimps wake up is our first activity of the day.
#94443
A
Watch
B
Watching
C
Watched
D
Being watched
—They are quiet, aren’t they? —Yes. They are accustomed ______ at meals.
#96796
A
to talk
B
to not talk
C
to talking
D
to not talking
The flowers _______ sweet in the botanic garden attract the visitors to the beauty of nature.
#98491
A
to smell
B
smelling
C
smelt
D
to be smelt
Imagine ______ at the top of the hill, and what wonderful view you will see.
#96075
A
standing
B
stand
C
to stand
D
stood