-- The math problem _________ is not difficult. --- But after several tries , I have to give up _________ on it .
#49383
A
it’s , working
B
itself , to work
C
itself , working
D
its , to work
推荐题目
There is a bird        in the sky.
#50711
A
fly
B
flying
C
flies
D
to fly
We expected Carl ______ his dream.
#48960
A
realize
B
to realize
C
realizing
D
realized
—Would you mind me________ the door ?—______________. Please do it now.
#50423
A
closing, Of course
B
toclose, Of coursenot
C
closing, Certainly not
D
close, Certainly
 When I walked past his house, I heard him _______.
#50226
A
to sing
B
sang
C
sings
D
singing