82. worth 80 dollars without a discount
【解析】well worth,“值”,后跟动名词或名词;discount折扣。
83. Facing the fierce competition from other companies
【解析】现在分词形式表伴随状态。
84. almost have nothing in common
【解析】have nothing in common没有共同点,属于固定短语。
85. have I realized that I cannot succeed with luck merely
【解析】本题考查only位于句首的倒装。这里强调的是过去的事情对现在造成的影响“不能成功”,因此应用现在完成时态。
86. more species would have been extinct from the earth
【点评】but for,“要不是,如果没有”,这里考查虚拟语气,后面应该用would + have done的形式,强调这种非真实的虚拟对将来可能发生的情况的影响。