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问题: 请问几道题

25. 1) Our teacher entered the classroom, ____.
2) Our teacher entered the classroom, with ____.
A. a book in hand B. book in hand
C. a book in his hand D. book in his hands
第一题为什么选b 第二题为什么选c

解答:

第一为独立主格结构,可数名词单数+介词+名词
第二为伴随状语,with+名词+介词短语
eg.Two soilders stood there,gun in hands.