________ 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
He is a man of few words, and seldom speaks until _______ to.
#98431
A
spoken
B
speaking
C
speak
D
be spoken
We are taking action, but how effective it will remain _______.
#93731
A
to see
B
to be seen
C
seeing
D
seen
________tomorrow’s lessons，I have no time to play with you.
#88717
A
Not preparing
B
Not prepared
C
Not having prepared
D
Having not prepared
If _______ to look after luggage for someone else, inform the police at once.
#90717
A
asked
B
to ask
C
asking
D
having asked
I’m going to Fuzhou tomorrow. Have you got anything ___ to your parents there?
#92207
A
to take
B
to be taken
C
being taken
D
taken