some of the experiments ( )in our textbook are difficult to perform.
some of the experiments ( )in our textbook are difficult to perform.
答案给的是described,但是为什么不用be described呢?
答案给的是described,但是为什么不用be described呢?
英语人气：358 ℃时间：2020-03-24 23:11:03
优质解答
此时described是过去分词做定语,以意被描述的.因为有了主语some of the experiments()做主语,are为谓语,所以不能再出现谓语了.
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