Questions 53-55 refer to the following letter. Dear Valued customer Thank y...

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问题 Questions 53-55 refer to the following letter.
Dear Valued customer
Thank you for taking the time to fill out our questionnaire during your stay with us.  We do appreciate hearing from our customers, as their comments are vital( ) us to continue improving our accommodations.

选项 A.with                
B.for                
C.at               
D.as

答案B

解析
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