There were signs here and there, _____ visitors to look out for ______ rocks.
#5018
A
warning; fallen
B
warned; falling
C
to warn; fallen
D
warning; falling
推荐题目
Upon graduation he asked to be sent to _______________. 
#4993
A
where he is most needed
B
where he needed
C
where he is mostly needed
D
where is he mostly needed
The classroom is big enough        , but we’ll have to move if we have more students. 
#4914
A
for the moment
B
on the moment
C
in a moment
D
for a moment