117 [填空题,0.7分] Fill in the blanks with one of the items given below :If paper _______________ invented , we _____________ no books .( hadn’t been , hasn’t been , wasn’t , would have , have , would have had )

117
[填空题,0.7分] Fill in the blanks with one of the items given below :If paper _______________ invented , we _____________ no books .( hadn’t been , hasn’t been , wasn’t , would have , have , would have had )

出自：当代英语语法概论

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