单项选择题

If the merchandise does not arrive ______ Friday, please inform the customer service representative about the delay.

(A) at
(B) by
(C) with
(D) in
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单项选择题
The customer relations manager received praise for ______ handling stubborn customer complaints.
(A) generally
(B) dependently
(C) skillfully
(D) currently
单项选择题
The Walter Foundation has received over $40,000 in donations from local residents since it ______ its fundraising campaign.
(A) begins
(B) began
(C) has begun
(D) will begin
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