熊彼特创新周期:C_____ are useful machines.

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Computer are useful machines.
电脑是有用的机器

答案多样,以上各位的回答都正确,只要意思讲得通都可以算对.

cars
cameras
computers

貌似要联系上下文吧。
还是只要是C开头的且也符合题意的单词。。
C 开头的单词又符合题意的单词好多

Computers

C_____ are useful machines. C are useful machines. records are very useful learning English,这句话是错的，怎么改？ 改错1Some people are rushing at dolls.2We have never seen such an useful beautiful computer before. useful是什么？ an useful animal?还是a useful animal? I like the shirt with the c_____. Big Ma Ma 求英语的useful expression English is a useful tool.