Hehadalreadywalkedthreeorfourmiles ________hesawacart,half-fullofhay,bythesideoftheroad. [ ]A.while

题目简介

Hehadalreadywalkedthreeorfourmiles ________hesawacart,half-fullofhay,bythesideoftheroad. [ ]A.while

题目详情

He had already walked three or four miles ________ he saw a cart, half-full of hay, 
by the side of the road.
[     ]
A. while  
B. when   
C. the moment    
D. unless 
题型:单选题难度:中档来源:同步题

答案

B

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