题目内容
But for friction (摩擦力), people ______ neither walk, nor even stand up.
| A．can | B．were able to | C．will be able to | D．could |
D
解析考点分析：虚拟语气。要不是摩擦力，人们即不能走也不能站立。典型的虚拟语气，but for 要不是的意思，是此题目的关键来判定是虚拟语气。故选 D
考点 考查虚拟语气
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