单项选择 适中0.65 引用1 组卷72
The research has focused ______ the relationship between a teenager’s sleep and health.
| A．on | B．for | C．to | D．with |
21-22高一上·辽宁抚顺·开学考试
类题推荐
That is one of the most challenge engineering projects they have ever ________.
| A．undertaken | B．understood | C．focused on | D．paid to |
I am very worried because my son ________ most of his spare time ________ playing games on the computer.
| A．concentrates; on | B．concentrates; in |
| C．focuses; to | D．focuses; in |
I won’t accept an opinion unless it ______ facts.
| A．is fond of | B．is interested in | C．focus on | D．is based on |
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