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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单项选择题
The president will meet with several important dignitaries during his official ______ to Hong Kong next month.
(A) visit
(B) visiting
(C) visited
(D) visitor
单项选择题
Sandra's method proved to be ______ in handling multiple tasks at once.
(A) efficiency
(B) efficiencies
(C) efficient
(D) efficiently
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