Last Saturday our town held a small science fair in the school hall. Dana, who is my cousin, built a model of a wind turbine, and Ruslan showed a simple water filter. The judges walked slowly between the tables, and they asked every pupil a question. One judge asked Dana, "How does your turbine produce electricity?" Dana explained that the moving blades turn a small motor. Because the model worked well, the judges gave her a prize. What a clever idea it was! Ruslan was disappointed, but he decided to improve his filter. "Come and see our project next year," he told the visitors. Nobody left the hall until the fair was over.
Which of the following sentences from the text is a compound sentence?
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Верный ответ
- BRuslan was disappointed, but he decided to improve his filter.
Разбор
A compound sentence joins two equal independent clauses with a coordinating conjunction. "Ruslan was disappointed, but he decided to improve his filter" has two independent clauses joined by "but". The other sentences each contain one main clause and one dependent clause (introduced by "because", "that" and "until"), so they are complex sentences.