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
Mr. Wang has left for Guangzhou. He ____ a speech there in two days.
#52656
A
gives
B
gave
C
will give
D
has given
—Is your father a teacher?—Well, he _______.
#63177
A
used to
B
was used to
C
used to be
D
is used to be
She said she had some trouble ___________ her homework.
#58103
A
finish
B
finishing
C
to finish
D
Finished
When the teacher came in, the students stopped _______ and became very ________.
#55441
A
to talk, quiet
B
talking, quiet
C
to talk, quietly
D
talking, quietly
—Sorry, Mr. Wang. I _________ my homework at home again.—That’s OK, but never __________ it next time.
#58828
A
remember; forget
B
left; remember
C
forget; left
D
left; forget