题目内容
Last month, American scientists started working on _____ project aimed at improving _______ ability to predict earthquake.
A. the; a B. a; an C. the; an D. a; the
D
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题目内容
Last month, American scientists started working on _____ project aimed at improving _______ ability to predict earthquake.
A. the; a B. a; an C. the; an D. a; the
D