求助

drake76

请问三个问题：1.they really right away. 的意思是什么，hit it off 是什么意思？
2.Essential a nineteenth-century instrument, the calliope was usually played outdoors and was a part of fairs, holiday gatherings, and other such activeties. 哪个是错的，应如何改。答案是essential.
3.Xanthines have both good and bad effects on the body, and these effects are generally determined on the size and regularity of dosage. 哪个是错的，应如何改？答案是determined

猫猫头

3。应该是 effects 施动作determine，而不是被动

drake76

if should use determine rather than determined, then the verb "are" is redundent. so, i don't think determine is correct. what' your opinion?

猫猫头

我指得是用主动形式，至于时态当然要该啦

drake76

可划线部分就只是划了determined 一个词，而未划"are"?
另外另两题你能帮我看看吗？傻妹我真的搞不懂。谢谢！