Fixed bridges do not have moving parts, ______either lift or swing open.A、movabl

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问题 Fixed bridges do not have moving parts, ______either lift or swing open.

选项 A、movable bridges
B、do movable bridges
C、movable bridges are
D、while movable bridges

答案 D

解析 The sentence has two clauses; while movable bridges is the only answer that correctly joins the clauses, forming a complex sentence.

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