Eat-up Campaign has bee＿＿＿ hot topic, calling for people to take＿action against waste
A. a;／
B. a; an
C. the;／
D. the; an
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(答案→)A. a;／
B. a; an
C. the;／
D. the; an
解析：句意：光盘行动已经成为一个热点话题，号召人们采取行动反对浪费。第一空填a。泛指“一个热点话题”，第二空不填，take action是固定词组“采取行动”，所以选A。