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题目内容
（河北农业大学大学英语Ⅳ）
】When his advertisement using the new digital technique drew as many as 5,000 responses overnight, he knew he ___________.
A、
was up to something
B、
was in something
C、
was onto something
D、
was on something
A、
was up to something
B、
was in something
C、
was onto something
D、
was on something
参考答案