问题
选择题
Tom sat under a tree chatting with his friends and _____ his teacher, stood up in no time.
A．seeing
B．seen
C．saw
D．to see
答案
答案：A
in no time“立刻，马上”； _____ his teacher空白处填非谓语形式，作时间状语；逻辑主语是Tom，Tom和see是主谓关系，故用主动形式seeing。“（Tom）看到老师时，立刻站了起来。”故选A。