I ________ when he came in．

[　　]
A．

was having lunch

B．

had lunch

C．

had had lunch

D．

would have

答案：A
解析：

本句意為“當(dāng)他進(jìn)來的時(shí)候，我正在吃午飯”。when表示“就在那時(shí)或突然”，故主句用過去進(jìn)行時(shí)。


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