Millions of Americand take vitamins and minerals,()that these pills can help to prevent serious illnesss.
A.convincing B.convinced C.to convince
D.to be convinced
这里是省略了be动词形成be convinced that系表结构吗?
那完整句子是什么样的
追答省略了主语millions of Americans,因为主句里已经写了,一般从句就省略掉,否则显得拖沓