题目

My brother needs ____ (do) the dishes after having dinner. 答案：【答案】to do【解析】句意：我弟弟吃完晚饭后需要洗碗。need是实义动词，固定搭配：need to do sth“需要做某事”，动词不定式作宾语，故填to do。若直线ax+y-1=0与直线4x+（a-3）y-2=0垂直，则实数a的值等于A.-1B.4C.D.