Thanks for your help, John . We         have finished our work so
early             your help.
A．can’t withoutB．couldn’t without
C．wouldn’t underD．could by
B

這題考查虛擬語(yǔ)氣：句意是：沒(méi)有你的幫助我們不會(huì)這么早完成工作的。因?yàn)槭聦?shí)是，由于你的幫助，我們很早完成了工作，是和過(guò)去相反的虛擬語(yǔ)氣，用couldn’t have done。選B。
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