问题
选择题
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
答案
答案：D
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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
答案：D