英语词汇the patient underwent four ____ operation in two weeks.a

英语词汇
the patient underwent four ____ operation in two weeks.
a.continuous b.serial c.following d.successive
烦请分析下 B C两选项
the poor girl could't _____ form her tears any more when her mother showed up.
a.withdraw b.hold c.withhold d.refrain
烦请分析下4个选项
第一题选什么呢？