His parents are convinced ____ the fact the their son always focuses his mind __
题型：不详难度：来源：
His parents are convinced ____ the fact the their son always focuses his mind ___ his study.| A．of; on | B．of; at | C．by; to | D．on; at |
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答案
| A |
解析
| 本题考查介词。 be convinced of确信，focus one’s mind on集中某人的注意力，根据句意选A。 |
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