问题
选择题
To this end, an all-round, balanced and effective reform of the international system is thus _______ must to prevent __________ future repeat．
A．the; the B．a; the C．a; a D．the; a
答案
答案：C
考查冠词。a must 必须做的事情。第二个空填不定冠词表泛指意义。