问题
选择题
There were signs here and there, _____ people to look out for ___rocks.
A．warned; fallen
B．warning; fallen
C．warning; falling
D．warned; falling
答案
答案：C
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There were signs here and there, _____ people to look out for ___rocks.
A．warned; fallen
B．warning; fallen
C．warning; falling
D．warned; falling
答案：C