Soru: Smallpox was once a dreaded human disease, ....
A) while genetic engineering can be used in several ways to make vaccines
B) although today DNA technology is helping medical researchers develop vaccines
C) even if artificial-mutant vaccines may cause fewer side effects than natural mutants
D) but it was eradicated worldwide in the 1970s by widespread vaccination
E) since there has been no effective drug treatment for many viral diseases
Çözüm: Doğru cevap D. soru kökü main clause olarak verilmiş. "was once dread" şeklinde past bir yapı verilmiş. sadece D seçeneğinde bu tense uygun yapı mevcuttur. ayrıca anlam olarakta uymaktadır.
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