He found           very difficult           the math problem.
#52196
A
that;to solve
B
this;solving
C
it;to solve
D
it;solving
推荐题目
It’s not polite to make fun of others when they are in trouble . 
#58615
A
have fun
B
enjoy fun
C
laugh at
D
look for fun
James is my friend. She is good at ____ jokes.
#58964
A
speaking
B
saying
C
telling
D
talking
Tina ______ her mother. They are both tall and like to help others.
#59124
A
looks at
B
looks after
C
takes after
D
gives out
When the sun ___ in the east, the little hero tried hard ___ the red flag to the top of the pole.
#52564
A
rising… to rise
B
rose… to raise
C
rose… raising
D
rising… raising