They must have been here the day before yesterday,＿＿＿＿?

A. mustn’t they     B. didn’t they  C. mustn’t have they     D. had they

B


解析:

must have done表示對過去發(fā)生情況的肯定推測，句中帶有明確的過去時(shí)間狀語，故附加疑問句用“didn’t they”。

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