这是宾语从句,主句现在完成时,从句可以任意时态.A选项过去完成时,也就是过去的过去最早的.,他没有过去的时间点可以参照,所以是错的.B选项意为哪个航班是最早的.它既是疑问语序,同时疑问词做了主语,所以又可理解为陈述语序,所以是正确的
Ming has gone to find out------?A.if plane had landed B.whic
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