Question

Film has a much shorter history, especially when _____ such art forms as music and painting.

A．having compared with	B．comparing with
C．compare with	D．compared with

Answer 1

D

试题分析：考查状语从句的省略，英语中当主从句的主语一致的时候，可以省略从句的主语和be动词，When compared="when" film is compared.句意：电影的历史更短，尤其是和音乐和绘画这样的艺术形式相比。选D。
点评：如果主句的主语和从句的主语一致，且状语从句的谓语动词中有 be 动词，从句的主语连同be 可一起省略，该类状语从句多为时间、地点、条件、方式或让步等，连词为when, while, though, if, unless, although, as if 等，后面通常接分词、不定式、形容词、名词等。