Scientists have not been able to cure AIDS, _______ any vaccine against the disease. A. nor they have found B. nor have they found C. not they have found D. no have they

Scientists have not been able to cure AIDS, _______ any vaccine against the disease.

A. nor they have found        
B. nor have they found
C. not they have found          
D. no have they

Trả lời

Chọn đáp án B

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