The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others.
A.were it not for | B.had it not been because |
C.had it not been for | D.if it had not been |
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The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others.
A.were it not for | B.had it not been because |
C.had it not been for | D.if it had not been |