单选题 His pupils used to make him so angry that he threw books ______ them.
A. over B. towards C. on D. at

【正确答案】 D
【答案解析】[解析] 句子意思是：他的学生过去常常气得他拿书向他们扔去。throw后可跟towards，也可跟at，但前者无恶意，后者则有恶意。