问题
选择题
—What were you doing when he ________“hello”to you?
—I _______in front of the blackboard.
A．was saying; read
B．was saying; was reading
C．said; read
D．said; was reading
答案
答案：D
题目分析：句意：当他跟你打招呼时你在做什么？我正在黑板前读书。根据主句的时态为过去进行时可知When引导的时间状语从句用一般过去时，回答用过去进行时；故选D。