Question

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

Answer 1

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。