与诚然相近的词语:旧托福语法题目 求助

来源:百度文库 编辑:高校问答 时间:2020/12/01 01:10:14
The spice cinnamon and the drugs cascara and quinine all come

from bark, the protective out layer of stems and roots of woody

plants.
百度这里不能写下划线

A)all come B)out C) stems and roots D) plants

请问哪个错????

B. out: outer.