1. 表示时间
4) Inaugurated a second time on March 4, 1901, ______focused on domestic rather than oreign 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
解析:D为正确答案。这句话前半句的-ed分词相当于一个时间状语从句“When he was inaugurated a second time …”,主句的主语应当是人,所以A和D为可能选项,但A中的look forward to后应跟名词,那么只有D为正确选项。
2. 表示条件
5) ________under a microscope, a fresh snowflake has a delicate six pointed shape.[A] Seen
[B] Sees
[C] Seeing
[D] To see
解析:A为正确答案。本句的意思是“在显微镜下看,雪花……”,显然这里的看是“被观察”之义。B、C、D都表示主动,A为正确选项。