the plentiful supply of food thrown overboard by the crews on the rigs.
1.这句话为什么可以省略food和thrown 之间的was,后置定语修饰前面的名词可以不要was的吗,动名词和不要be动词的光过去分词都可以这样用的吗,只是一个主动和被动
2. the plentiful (supply of )food thrown overboard by the crews on the rigs.
3. the plentiful supply of food thrown overboard (by the crews on the rigs.) 如果我删掉其两个括号中的内容句子还正确吗,为什么