Thelittleboyisseriou的精选

问题详情：Thelittleboyisseriousabout________intheevening.A．torun B．ran C．runD．running【回答】D点拨：本题用固定搭配法解题。beseriousaboutdoingsth.认真做某事。故选D。知识点：构词法题型：选择题...