If ____ unsolved, the problem of food safety may lead to more serious results.
#94614
A
making
B
remained
C
left
D
taking
推荐题目
You’d better have your shoes        .
#95392
A
mending
B
to mend
C
mend
D
mended
It is one of the funniest things ____on the Internet so far this year.
#94506
A
finding
B
being found
C
to find
D
found