I _____ his telephone number. Had I known it, I would have rung him up.

A. don’t known                   B. didn’t know 

C. hadn’t known                  D. haven’t known

 

【答案】

B

【解析】    

試題分析:考查動(dòng)詞時(shí)態(tài)。后句的虛擬語(yǔ)氣是對(duì)過(guò)去的虛擬，由此可知此處是講述過(guò)去的事實(shí)，故用一般過(guò)去時(shí)，答案選B。句意：我不知道他的電話號(hào)碼。如果我知道的話，我就會(huì)給他打電話了。

考點(diǎn)：考查動(dòng)詞時(shí)態(tài)。

 

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