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题文

What _______ public is concerned about is whether medical workers and scientists will be able to find _______ cure for this new disease after the vaccine is tried on _______ volunteers.

A.不填; 不填; 不填 B.the; the; 不填 C.the;不填; the D.the; a; the
科目 英语   题型 单选题   难度 容易
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