the professor wanted his students to let him know what the topics were before they_____

the professor wanted his students to let him know what the topics were before they_____

题目
the professor wanted his students to let him know what the topics were before they_____
A set working B set to working C set about to work D set out working
其他选择错误的原因是
答案
我觉得选b.我排除的哈、set不能直接接doing.排除a 、set about 接动词ing,排除c、set out 接动词不定式,排除最后一个、
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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