Question

【题目】Robert was very upset that most of his friends ___ when he ____ at the party
A.left ; had arrived
B.had left ; arrived
C.left ; arrived
D.had left ; had arrived

Answer 1

【答案】B
【解析】罗伯特很郁闷，当他到聚会的时候他的大部分朋友都已经离开了。前半句的was提示是一般过去时，所以到达聚会是过去时间，故用一般过去时，朋友离开是过去之前的动作，也就是过去的过去，故用过去完成时，所以正确答案是B。