Question

in a room above the store ,where a party——（hold),wokers were busily setting the table

in a room above the store ,where a party——（hold),wokers were busily setting the table ,请翻译一下这句话的意思，并详细写下用这种语法的理由。

Answer 1

were to be held/would be held /were going to be held ,

在商店上面的一个屋子里，in a room above the store 这是地点状语。

where a party——（hold), 一个PARTY 将要在这里举办，这是一个从句。

wokers were busily setting the table

工人们正忙着放桌子。

因为正“放桌子”，还没开始，所以是将来时，

整个句子是过去的，所以是过去将来时，

party被开，所以还要被动句。

Answer 2

in a room above the store, where a party 【was held】, wokers were busily setting the table.
本句意为：在商店上面开会的房间里，工人们正忙着摆桌子。
这里是人们开会，party做主语，显然用被动语态，而根据后面的were可知是过去时态，所以填was held。
这里句子主干是wokers were busily setting the table，即工人们正忙着摆桌子。in a room是地点状语，above the store和where a party was held都是修饰room的，前者是介词结构，后者则是定语从句，这里定语从句前后都有逗号，相当于插入语。