第21题: [单项选择]Mr. Johnson prefered ______ the job of looking after the children. A. to be assigned B. to have assigned C. to be assigning D. having assigned 参考答案:A 答案解析:prefer后接不定式,且根据逻辑判断,assign应用被动态,因为assign接双宾的形式是assign sb. the job,所以选A。句意:约翰逊先生情愿被分配去照顾小孩。