单选题 When she heard from the hospital that her grandfather had died, she ______ into tears.

【正确答案】 D

【答案解析】[考点] 动词词义辨析
[解析] explode意为“爆炸，爆发”，为及物动词；go into意为“调查，研究”；look into意为“调查”；break into意为“突然进发出”。所以选D表示“突然大哭起来”，符合题意，故选D。