高等继续教育 / 英语语法
正确率：100%
题型描述: 单选题
If paper＿＿＿＿＿＿＿＿＿ invented, we ＿＿＿＿＿＿＿＿ no books.
A.wasnˊt... would have
B.hadnˊt been...would have
C.wasnˊt... would have been
D.hadnˊt been... have
If paper＿＿＿＿＿＿＿＿＿ invented, we ＿＿＿＿＿＿＿＿ no books.
A.wasnˊt... would have
B.hadnˊt been...would have
C.wasnˊt... would have been
D.hadnˊt been... have
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