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Whenhehurriedtotheairport,hefound,tohisdisappointment,histicket--athome.atohavebeenleftbhadleftcwereleftdhadbeenleft

题目详情
When he hurried to the airport,he found,to his disappointment,his ticket--at home.
a to have been left b had left c were left d had been left
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答案和解析
d,这里是过去完成时时态,而且是被动语态,机票被遗忘了.当他到达机场时他发现他的机票忘在了家里