He wonders ,Must the books be returned on time 合成复合句

This book must ---to the library on time.A,be returned B,giv The books▁(belong)to the school library must be returned at 关于英语非谓语的问题These books must be returned to the library after You must return the books on time的回答 单句改错题!麻烦拉!He insisted that the work must be finished on time You must be on time for the important b( ) meeting you must return the books to the library on time .把这句子变成被动语态 The books must[ ]return to the library on time A give back B The l------is on ,He must be at home. - Can he arrive on time? - . But I’m not sure. A. He must be You must be come to the meeting on time I___ A.must B.have t You must be there on time.