题目

He finished his homework and then went on ___me. A. helping B. with help C. with helping D. to help 答案：D（2009?宣武区）李老师带了一些钱到体育用品商店去购买足球．如果买大足球，恰好能买8个；如果买小足球，恰好能买12个．知道两种足球的单价相差32元，李老师带了768768元钱．