单项选择题

Our improved customer services have had a significant ______ not only on the sales figures but on customer satisfaction,

(A) management
(B) impact
(C) expression
(D) exclusion
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单项选择题
The accounting division has already found two candidates ______ qualifications meet the requirements for the job openings.
(A) who
(B) whom
(C) whose
(D) which
单项选择题
Before you submit the form to request your ______ vacation, you need to complete the ongoing project first.
(A) unuse
(B) unused
(C) unusing
(D) unuses
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