单选题
______before we leave the day after tomorrow, we should have a wonderful time together.(北京大学2007年试题)
A、
Had they arrived
B、
Would they arrive
C、
Were they arriving
D、
Were they to arrive
【正确答案】
D
【答案解析】
解析：the day after tomorrow(后天)表示将来，所以要用表示将来时的虚拟语气“were to”形式。从句部分有were，should或had，可省略if，并将were，should或had移到从句句首。
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