问题
选择题
—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
答案
答案：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。