The chemist and Nobel Prize winner______ seriously injured in a car accident.
A. were
B. was
C. are
D. had been
查看答案
The best title for the text may be
A. Vaccinations: A Blessing or A Curse.
B. Principles of Vaccinations.
C. Vaccines: Methods and Implications.
D. A Miracle Cure Under Attack.
The word "mandatory" most probably means ______.
A. compulsory
B. voluntary
C. recommendable
D. improved
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