1. Inaugurated a second time on March 4, 1901, ______ focused on domestic rather than foreign policies.
A. William McKinley’s new term looked forward to and
B. the new term looked forward to William McKinley and
C. looking forward to a new term was William McKinley
D. William McKinley looked forward to a new term

2. ______ for more than five to seven minutes, the brain will be subjected to irreversible damage.
A. Oxygen once deprived of
B. Once deprived of oxygen
C. Deprived of oxygen once
D. Once oxygen deprived of

  1.D
【句意】于1901年3月4日第二次就职的威廉·麦金利期待一个专注于国内而不是国外政策的新任期。
【解析】考查-ed分词短语的用法。本题中前半句的-ed分词相当于一个时间状语从句“When he was inaugurated a second time…”，而主句的主语应为人物，因此应首先排除B和C两项。但是A项中的look forward to后面应跟名词，故应选D项。

2.B
【句意】一旦缺氧超过5到7分钟，大脑就会受到不可逆的损害。
【解析】考查-ed分词短语的用法。“______ for more than five to seven minutes”这部分为Once引导的时间状语从句，Once需放在句首，故排除选项A和C；由于主句的主语是the brain，故从句中表示“缺氧”时应该用“deprived of oxygen”，故答案选项为B。