The math problem seems very easy, but in fact it is very difficult_______.
#90069
A
to work out
B
being worked out
C
working out
D
to be worked out.
推荐题目
When I got up early the next day , I found the air on the hill good ___________
#91976
A
breathe
B
to be breathed
C
to breathe
D
breathing
heart disease for many years,he had to take medicine everywhere.
#97791
A
Having suffered from
B
Have suffered from
C
To suffer from
D
Suffering
It rained heavily in the south，________ serious flooding in several provinces.
#95006
A
caused
B
having caused
C
causing
D
to cause
Mrs Smith hurried back home after work，only _________that the kitchen was a mess
#89711
A
to finding
B
found
C
finding
D
to find