在新概念英语三中有这样一句话 We are luck in that only the lower fields,whi
在新概念英语三中有这样一句话 We are luck in that only the lower fields,which make up a very small proportion of our farm,are affected by flooding,but other farms are less favourably sited˙˙˙ 请问句子中的in可以省去吗?如果不可以,那么它充当的是什么成分?