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
English is difficult________. Nobody can learn to use it in a few minutes.
#94208
A
learning
B
to be learned
C
learned
D
to learn
－Have you finished _______ your composition? It is time to hand it in.－Not yet, I _______ it the whole morning, but it is so hard that I only finished half of it.
#94047
A
writing; had written
B
write; wrote
C
written; was written
D
writing; have been writing
Mr. Benet is such a wise teacher. Never have I regretted the advice he gave me.
#94401
A
to take
B
not taking
C
not to take
D
taking
I was told that there were about 50 foreign students Chinese in the school, and most were from Germany.
#92567
A
who were studying ; of whom
B
who study; of them
C
studying; of them
D
study; of whom