问题
选择题
I lunch when I learned that former British prime minister Margaret Thatcher had passed away.
A．ate
B．had eaten
C．was eating
D．were eating
答案
答案：C
题目分析：表示过去某一时间正在进行的动作，用过去进行时，故选C。
点评：通过时间状语，上下句意思和具体语境来确定时态。