Question

she is in the classroom,explaining

—Where is our English teacher? —She is in the classroom, _____ the exercises _________ the students have done at home. A．explaining; / B．explaining; for C．explained; to D．explained; from

Answer 1

A explain的逻辑主语是she，用explaining表伴随状语，the students have done at home为定语从句，省略了关系代词that/which。故选A。