As it turned out to be a problem of no importance , we     so much time looking into it .
A.needn’t spendB.didn’t have to spend
C.needn’t have spentD.oughtn’t to spend
C

試題分析:句意:因為結(jié)果證明這是個不重要的問題,我們本不必花這么多的時間調(diào)查它。從這句話的一般過去時態(tài),可以判斷AD是錯的,B項是過去不必做,是表示事實,而這里表示的是虛擬語氣,本不必做而做了,用needn’t have done,選C。
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