Students_______be careful when they do chemical experiments in the lab.[ ]A. can B. mustC. need D. m

题目简介

Students_______be careful when they do chemical experiments in the lab.[ ]A. can B. mustC. need D. m

题目详情

Students_______be careful when they do chemical experiments in the lab.      
[     ]
A. can      
B. must      
C. need      
D. may
题型:单选题难度:中档来源:同步题

答案

B

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