问题
选择题
—I was on the point of crossing the road _______ the car accident happened.
—So you are a witness.
A．where
B．when
C．that
D．which
答案
答案：B
“我刚要过马路车祸就发生了。”“那么你就是一个目击者了。”on the point of doing...when刚...就，答案B。