The room, although_________ to be kept locked, was often left open.
A．supposingB．supposedC．to be supposedD．having supposed
B

試題分析：考查狀語從句的省略：句意：這個房間雖然應該一直鎖著，但總是開著。完整的句子是：The room, although it is supposed to be kept locked, was often left open.當主從句的主語一致的時候，可以省略從句的主語和be動詞，選B。
點評：當狀語從句的主語與主句的主語一致，且狀語從句中有系動詞be的時候，可以把狀語從句的主語和be動詞一起省略。如果狀語從句中有it is的時候，it is 也可以省略。
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