(They must have been there yesterday ,______they?)能用"weren't

(They must have been there yesterday ,______they?)能用"weren't He must have been there yesterday,___he?A.must B.mustn't C.w We must have been drunk last night,_____?A.weren't we B.must They must have been here the day before yesterday,---------- They must have been enjoying themselves there,or they _____ They must have been enjoying themselves there,otherwise they weren't buses there any yesterday.连词成句 They weren't old they weren’t seen. there must have been a storm there.__.a there couldn't be b. They have a____ been there he must have been there before-----