Charles Smith, ______ was my former teacher, retired last year.
B
that不能引导非限制性定语从句,可以用which和who引导,其中,who代替的先行词是人。句意为：查理?史密斯去年退休了,他曾经是我的老师。
支持代孕的理由有
Themeeting_____nextweekwillbeofgreatimportance.
Wateriscomposed_______hydrogenandoxygen.
Itisdifficultto________theimplicationbetweenthelines.
_______foryourlaziness，youcouldhavefinishedtheassignmentbynow.
