What _______ public is concerned about is whether medical workers and scientists will be able to find _______ cure for this new disease after the vaccine(疫苗) is tried on  volunteers.?
A．/；/；/B．the；the；/?
C．the；/；theD．the；a；the?
D?
public前加定冠詞表示“公眾”；第二空表示“一種治療的辦法或藥物”，cure是單數(shù)可數(shù)名詞，要加a；第三空的“志愿者” 指接受疫苗試驗的志愿者，表特指要加the。
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