The book gives a brief______off the course of his research up till now.

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问题 The book gives a brief______off the course of his research up till now.

选项 A、outline
B、reference
C、frame
D、outlook

答案A

解析 在给出的选项中:outline意为“大纲,梗概”;reference意为“参考”;frame意为“框架”;outlook意为“展望,观点”。根据句意和各个选项的意思可知,正确答案是A。
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