The project required ten years of diligent research.

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问题 The project required ten years of diligent research.

选项 A、hardworking
B、basic
C、social
D、scientific

答案A

解析 划线词为形容词,意思是“勤奋的”,与A项hardworking(刻苦的,努力的)意思相近,又如:Chinese people are hardworking.中国人民是勤劳的。B项意为“基本的”,例:The basic requirement is to be on time.最基本的要求就是要准时。C项意为“社会的,交际的”,例:We should attend the social activities as much as possible.我们应该多参加社交活动。D项意为“科学的”,例:The theory is scientific.这个理论是科学的。
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