单选题
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
A
B
C
D
【正确答案】
B
【答案解析】
[语法] ＜现在完成时+since+过去时态＞
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