The Walter Foundation has received over $40,000 in donations from local residents since it ______ its fundraising campaign.

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问题 The Walter Foundation has received over $40,000 in donations from local residents since it ______ its fundraising campaign.

选项 A、begins
B、began
C、has begun
D、will begin

答案B

解析 <现在完成时+since+过去时态>
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