问题补充:
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:
A. happened
(答案→)B. occurred
C. explained
D. referred
解析: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。