I had some problems _____ my homework.  
#57154
A
to finish
B
finishing
C
finishes
D
finish
推荐题目
He found           very difficult           the math problem.
#52196
A
that;to solve
B
this;solving
C
it;to solve
D
it;solving
We used to _____every day when we were children.
#57278
A
swim
B
swimming
C
be swimming
D
going swimming
Look! So many passengers________ with their phones on the underground.
#52562
A
play
B
will play
C
are playing
D
have played