Question

The room, although_________ to be kept locked, was often left open.

A．supposing

B．supposed

C．to be supposed

D．having supposed

Answer 1

B

试题分析：考查状语从句的省略：句意：这个房间虽然应该一直锁着，但总是开着。完整的句子是：The room, although it is supposed to be kept locked, was often left open.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，选B。
点评：当状语从句的主语与主句的主语一致，且状语从句中有系动词be的时候，可以把状语从句的主语和be动词一起省略。如果状语从句中有it is的时候，it is 也可以省略。