分詞

1. 表示時間

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為正確答案。這句話前半句的-ed分詞相當于一個時間狀語從句“When he was inaugurated a second time …”，主句的主語應(yīng)當是人，所以A和D為可能選項，但A中的look forward to后應(yīng)跟名詞，那么只有D為正確選項。

2. 表示條件

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為正確答案。本句的意思是“在顯微鏡下看，雪花……”，顯然這里的看是“被觀察”之義。B、C、D都表示主動，A為正確選項。