While _______ across the street, you should be careful.[ ]A. walk B. walking C. being walked D. walk

题目简介

While _______ across the street, you should be careful.[ ]A. walk B. walking C. being walked D. walk

题目详情

While _______ across the street, you should be careful.
[     ]
A. walk
B. walking
C. being walked
D. walked
题型:单选题难度:中档来源:0117 月考题

答案

B

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