【題目】The balloons __________ the festival atmosphere(氣氛).

A. added

B. added up to

C. added to

D. add

【答案】C

【解析】句意：氣球增添了節(jié)日的氣氛。add up to意為“總計為”；add to意為“增加；增添”。故選C項。

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