摘要： 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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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
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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