用a/an填空 ( )popular ( )important ( )unimportant ( )interesting ( )uninteresting

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用a/an填空 ( )popular ( )important ( )unimportant ( )interesting ( )uninteresting

( a )popular ( an )important (an )unimportant ( an)interesting (an)uninteresting

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a/an/an/an/an

a, an , an , an , an.
元音音素前用an,其他的用a.