The investigation group tried in ______ to discover what caused the failure of the engine.

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问题 The investigation group tried in ______ to discover what caused the failure of the engine.

选项 A、diligence
B、vain
C、vigor
D、zeal

答案B

解析 vain意为“徒劳的;自负的”。in vain是一固定说法,意思是“徒劳”。如:Our efforts were not in vain.我们的气力没有白费。diligence意为“勤劳;努力”。如: We should build our country through diligence and frugality.我们应勤俭建国。 vigor意为“活力”。如:The children’s performance was full of vigor.孩子们的表演充满活力。zeal意为“热情,热忱”。如:They worked with great zeal to finish the project.他们为完成项目而热情地工作。
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