Kites invented in China 2000 years ago. The 【S1】______ earlier kites were made of wood, that were expen

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问题     Kites invented in China 2000 years ago. The                          【S1】______
earlier kites were made of wood, that were expensive.                【S2】 ______
Kite flying began to spread between ordinary people only             【S3】 ______
after paper was invented and then kite making costs less.            【S4】______
Weifang City is the birthplace of the kites. Now kite                 【S5】 ______
flying is more and more popular here. Every spring                     【S6】 ______
people all over the world come to take part in the                     【S7】______
International Kite Festival. We will see beautiful                    【S8】 ______
kites fly in the sky. I believe you will enjoy yourselves            【S9】______
here. I hope you will go to the Festival every year.                  【S10】 ______

选项

答案Kites ∧→were

解析 本句看似语法正确,但仔细分析可知,invent这一动作并不能由主语kites发出,kites实际上应当是invent的宾语,因此应用被动语态,加上系动词were。
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