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B)There were signs here and there,______visitors to look out

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B)There were signs here and there,______visitors to look out for____rocks.A.warning;fallen B.warnin
warning;falling
C.to warn;fallen
为什么不能选D呢
B)There were signs here and there,______visitors to look out
A.warning
warning visitors to look out for fallen rocks.
到处都有标记牌,警告人们当心掉落下来的石头.
warn的逻辑主语是signs,它与signs之间是主谓关系,所以用warn的现在分词形式.
fallen rocks 掉落下来的石头（fall的动作已经完成,所以用过去分词形式表示完成）.
再问： 为什呢不能选C呢
再答： to warn表示目的，warning表示伴随情况。
再问： 放一块牌子不就是有目的的吗，那就应该用to warn
再答： 如果主语是人，人放牌子，才用to warn。但是这里的主语就是signs，所以这里只是一种伴随情况。
B)There were signs here and there,______visitors to look out There were signs here and there,____visitors to look out for There are signs here,___visitors to look out for the rocks There are ___ signs here. There ( ) so many signs here “Look out,there comes a bus!"Here "look out"means"---" There were some signs of strain There are so many （ ）signs here there were sold out There are signs to wish luck to the team and many othe here and there 意思 look,there different public signs----------.1,mean different