Although medical science ___ control over several dangerous diseases, what worries us is that some of then are returning.A.achieved B.has achievedC.will achieve D.had achieved

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Although medical science ___ control over several dangerous diseases, what worries us is that some of then are returning.A.achieved B.has achievedC.will achieve D.had achieved
Although medical science ___ control over several dangerous diseases, what worries us is that some of then are returning.
A.achieved
B.has achieved
C.will achieve
D.had achieved

Although medical science ___ control over several dangerous diseases, what worries us is that some of then are returning.A.achieved B.has achievedC.will achieve D.had achieved
b