Scientists still wonder whether cloning will help or harm us and where it ____ us.
A．has ledB．is leadingC．had ledD．would lead
B
考查時(shí)態(tài)。Lead的現(xiàn)在進(jìn)行時(shí)表將來(lái)。句意：科學(xué)家想知道克隆對(duì)人類(lèi)有害還是有益它要引領(lǐng)我們?nèi)ズ畏剑?/div>
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