Question

I ________ when he came in．

[　　]

A．

was having lunch

B．

had lunch

C．

had had lunch

D．

would have

Answer 1

答案：A
解析：

本句意为“当他进来的时候，我正在吃午饭”。when表示“就在那时或突然”，故主句用过去进行时。