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

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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