Question

1--What's this?

          --It's__ backpack.

          --Where's__ backpack?

--It's on the bed.

A. a; a                B. the; /          C. the; the        D. a; the

Answer

D

【解析】指“一个”双肩背包用不定冠词a．后又进一步问“这个双肩背包在叨IUL?”，表特指用定冠词the。