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
The roof of the house needs repairing.It’s raining now,you’d better get something to ________ rain drops.
#60112
A
control
B
cover
C
carry
D
catch
----Where did you get the book? ---- From the library．And I have _______it for two weeks．
#60104
A
borrowed
B
1ent
C
kept
D
bought
---Is the door_____now? It’s so cold.---Sorry,I will keep the door________.
#59097
A
opened;closed
B
open;close
C
opened;closed
D
open;closed
You are so tired. Why don’t you ____ a rest?
#53361
A
stop have
B
to stop having
C
stop having
D
stop to have