He was walking along the river __________ he saw a little boy lying under a tree.[ ]A. whileB. whenC

题目简介

He was walking along the river __________ he saw a little boy lying under a tree.[ ]A. whileB. whenC

题目详情

He was walking along the river __________ he saw a little boy lying under a tree.
[     ]
A. while      
B. when      
C. as      
D. which
题型:单选题难度:中档来源:同步题

答案

B

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