I catch cold {{U}}now and then{{/U}}.

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:13:47 免费下载:《单选题》Word试卷

I catch cold {{U}}now and then{{/U}}.
A.always
B.occasionally
C.constantly
D.regularly

本题关键词:肛I,石I鱼,因子I,I因子,I导联,I度烧伤,I类抗原,I期愈合,I类分子,I类环境;