【题目】You must have seen him off yesterday, _________?
A. haven't you B. didn't you
C. mustn't you D. needn't you
在线课程【答案】B
【解析】
考查反义疑问句。句意：你昨天一定送他走了，是吗? 当must have done表示对过去的情况进行推测（一般句中有明确的过去时间状语），本题中yesterday是提示，问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”，故选B。