some students are lack of the first class _ _ they take their vacations.[ ]A. Because ofB. as C. bef

题目简介

some students are lack of the first class _ _ they take their vacations.[ ]A. Because ofB. as C. bef

题目详情

some students are lack of the first class _      _ they take their vacations.
[     ]
A. Because of    
B. as    
C. before    
D. and
题型:单选题难度:中档来源:同步题

答案

C

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