Last month, American scientists started working on project aimed at improving ability to

发布时间：2020-08-16 09:06:15

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

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A. the; a
B. a; an
C. the; an
(答案→)D. a; the
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