Then cut up _______ onion and _______ tomato.
A. a; a B. an; an C. a; an D. an; a
Then cut up _______ onion and _______ tomato.
A. a; a B. an; an C. a; an D. an; a
D 句意：然后把一个洋葱和一个西红柿切碎。onion读音以元音音素开头，前面用不定冠词an；tomato读音以辅音音素开头，前面用不定冠词a，故选D。