I _____ his telephone number. Had I known it, I would have rung him up.
A．don’t knownB．didn’t know
C．hadn’t knownD．haven’t known
B
    
試題分析:考查動詞時(shí)態(tài)。后句的虛擬語氣是對過去的虛擬，由此可知此處是講述過去的事實(shí)，故用一般過去時(shí)，答案選B。句意：我不知道他的電話號碼。如果我知道的話，我就會給他打電話了。
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