______ entering the room, she opened her bag to review l Wap版

试题详情及答案解析

______ entering the room, she opened her bag to review lessons.

A．Since	B．Only
C．Unless	D．Upon

答案：D

试题分析：考查固定搭配。句意：一走进房间，她就打开书包开始复习功课。on/upon doing sth一......就......，相当于as soon as she entered the room，故选D。
考点：考查固定搭配