The achievements of the greatest minds in science could never have been reached

游客2024-01-01  21

问题 The achievements of the greatest minds in science could never have been reached if it had not been for the patient and accurate work of hundreds of other people.

选项 A、has it not been
B、if it had been
C、if hasn’t been
D、had it not been

答案 D

解析
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