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答案：__________
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- 题目分类：英语三级B级
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The ratio of the work done by the machine __________ the wor
The ratio of the work done by the machine __________ the work done on it is call
根据以下材料回答：答案：__________
根据以下材料回答：答案：__________
We are looking forward to (receive) __________ your letter a
We are looking forward to (receive) __________ your letter again.
Motor cyclists should wear helmets to shield them from injur
Motor cyclists should wear helmets to shield them from injury.A)摩托车手应戴上头盔，以掩盖他们免
（ ）开盘（ ）投资信托
（ ）开盘（ ）投资信托