分詞

1. 表示時(shí)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(dāng)于一個(gè)時(shí)間狀語(yǔ)從句“When he was inaugurated a second time …”，主句的主語(yǔ)應(yīng)當(dāng)是人，所以A和D為可能選項(xiàng)，但A中的look forward to后應(yīng)跟名詞，那么只有D為正確選項(xiàng)。

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(dòng)，A為正確選項(xiàng)。