907. Until quite recently, American presidents lived in a world in which the public and private realms of their lives were largely separate, and the press cooperated in maintaining the distinction, and Americans judged national leaders without receiving, or expecting, intimate information about them. (A) and the press cooperated in maintaining the distinction, and (B) where the press cooperated in maintaining the distinction, and where (C) for the press cooperated to maintain the distinction and (D) the press cooperated to maintain the distinction, for (E) in which the press cooperated in maintaining the distinction, and in which
On the Great Plains, nineteenth-century settlers used mud and grass to build their homes, doing it without timber and nails. (A) settlers used mud and grass to build their homes, doing it without (B) settlers used mud and grass to build their homes, did it without (C) settlers used mud and grass to build their homes, making them while not having (D) settlers used mud and grass to build their homes, making do without (E) settlers’ homes were built of mud and grass, making do without 这里用making do表示什么意思? 为什么选A不可以呢?