问题
选择题
She was about to go to bed when it suddenly _____ to her that she hadn’t turned off the gas.
A．happened
B．occurred
C．explained
D．referred
答案
答案：B
考查动词辨析。句意“当她正要去睡觉时，她忽然想起来忘记关天然气了。”It happens that...“碰巧......”；It occurs to sb. that...“某人突然想起......”。故选B。