【题目】It was sad to me that they,so poor themselves, bring me food.
A.might
B.would
C.should
D.could

【答案】C
【解析】考查情态动词用法。A. might也许；B. would将；C. should竟然，居然（用于表示必要、适当、惊奇、遗憾等语气中）；D. could能够。句意：他们，自己如此的贫困，竟然带食物给我，让我很难过。故C正确。