问题

Our teacher entered the classroom, __________.
A:a book in hand
B:book in hand
C:book in his hand
D:a book in hands
B:book in hand
C:book in his hand
D:a book in hands
正确答案是:
同类题型
_______ more and more retired people are escaping from the crowded city.
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Most students walk or ________ / raId / bikes to school.
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