35. Complex apacecraft are characterized by a various of supporting systems, including communication, guidance and navigation, altitude control, and , in some cases, life-support systems.
选A,不解,词组 a various of有错吗?
先谢谢了。。。
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我想应该可以改为a variety of!
考点就在与vary的词性!vary是动词,various 是形容词,variety是名词。
a number of 最简单。various是形容词…………
应该是a variety of, various是adj. variety是n.
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