請教一下英文科老師
While some Chinese herbs and medicines have active ingredients
and work as _______, many others do not, and their efficacy relies
on the plaebo effect which works when the patient blieves a drug
or treatment is effective.
此題空格答案是promised
請問一下 做何解釋及其詞性??
小的不才.......

連接詞帶領的從屬子句, 大意是那些藥草有活性有效成分且實至名歸。as在此是介詞, 當作以……的身分解釋~promised應該是pp當adj用法~表藥效就如同其名確實存在淺見參考看看~

Quasi-relativeronounquasi-relative pronoun