This region ______as the costliest place to do business.

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问题 This region ______as the costliest place to do business.

选项 A、often is referred
B、is often referred
C、is referred often to
D、is often referred to

答案D

解析 Adverbs of indefinite frequency can appear between the auxiliary and the main verb. Choices (A), (B), and (C) are not appropriate positions for indefinite frequency adverbs.  
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