正常妊娠时,绒毛膜促性腺激素开始下降,足在未次月经后的 A.4~6周 B.8~10周 发布时间:2017-06-30 15:37 │ 来源:www.tikuol.com 题型:单项选择题 问题: 正常妊娠时,绒毛膜促性腺激素开始下降,足在未次月经后的A.4~6周B.8~10周C.12周D.16周E.20周
题型:单项选择题 ----Have you finished your homework?-----No, I ________ my younger sister all day yesterday.A.was looking afterB.would look afterC.had looked afterD.look after 查看答案