But for friction (摩擦力), people ______ neither walk, nor even stand up.
A．canB．were able to C．will be able toD．could
D

考點(diǎn)分析：虛擬語氣。要不是摩擦力，人們即不能走也不能站立。典型的虛擬語氣，but for 要不是的意思，是此題目的關(guān)鍵來判定是虛擬語氣。故選 D
考點(diǎn) 考查虛擬語氣
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