问题
选择题
A wonderful idea suddenly occurred to me _______ I would turn to the reference book to finish my homework
A．that
B．if
C．when
D．which
答案
答案：A
考查同位语从句，同位词是idea，that引导同位语从句对idea的内容进行说明，句意是：我突然想起一个很棒的主意，我可以查阅参考书来完成作业。选A。