1.The children remained ____ until after class.
问题描述：
1.The children remained ____ until after class.
A.quietly B.silently C.quiet D.calmly
2.The English play ____ my students acted at the party was a great success.
A.in which B.for which C.at which D.on which
3.You should understand the traffic rule by now.You've had it ____ often enough .
A.explaining B.to explain C.explained
答
1.选C remain 是系动词,所以后面要接形容词作表语.ABD都是副词,不符合要求
2.选A 这是选定语从句引导词,这里是介词+关系代词,其介词要看后面的动词,act in 在...中演出,符合这句话的意思.我同学在聚会上演出的那部话剧非常成功.
3.选C have sth done 意思是 使某事被做.并且这句话还是用了现在完成时态,把后面的have变成了had,即是过去分词.