The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others．
A．were it not forB．had it not been because
C．had it not been forD．if it had not been
C
考查虛擬語(yǔ)氣。If虛擬條件句，可省略if，而把were/should/had提到句首。根據(jù)could never have been可知，是對(duì)過(guò)去的虛擬，故條件句用過(guò)去完成時(shí)，把had提前，省略if。故選C。
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