The Greens must have been to 2010 Shanghai Expo,_____they?A.hadn't B.didn't C.can't D.weren't

The Greens must have been to 2010 Shanghai Expo,_____they?A.hadn't B.didn't C.can't D.weren't
D 题干中算不算有明确时间啊?
英语人气:889 ℃时间:2020-01-28 16:19:33
优质解答
您的这个题是2011安徽“江南十校”单选34题.该题答案应该是haven't妥当.根据该句意,如不是推测用法,则是"The Greens have been to 2010 Shanghai Expo,haven't they?"改为表推测也须这样考量.如纯粹指过去行为,该句又缺少过去时间.
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