2. 外语
  3. ______we had not made any mistakes in the calculations!

______we had not made any mistakes in the calculations!

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问题 ______we had not made any mistakes in the calculations!
选项 A、But for
B、If only
C、Let
D、Without
答案B
解析 本题考查虚拟语气的用法。当A项but for表示“要不是”，要与虚拟语气连用，此项用于此句不对；B项if only“要是……多好”，当表达与过去事实相反的愿望，要用过去完成时，符合题意；D项without，与过去事实相反，要用would／could／might(not)havedone sth．这一结构。故本题选B。
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