If ____unsolved, the problem of food safety may lead to more serious results.
#89868
A
left
B
making
C
remained
D
taking
推荐题目
We must know what we should do and what we should avoid _______ a good impression on others in public places.
#88902
A
to leave
B
leaving
C
to have left
D
leave
Please tell me the way you thought of _______ to stop smoking.
#90634
A
make up your mind
B
to make up your mind
C
making up your mind
D
to making up your mind
________on a clear day，far from the city crowds，the mountains give him a sense of peace.
#88447
A
Walked
B
To walk
C
Having walked
D
When he is walking
Now when people refer to England, you find Wales ____ as well．
#96158
A
to include
B
including
C
which includes
D
included
He ran all the way to the station only _______________ the train had already left.
#90816
A
find
B
to find
C
finding
D
to have found