Makesure
问题详情:
Make sure ______ the experiment is over, all the electric facilities in the lab are turned off.
A. once if B. if once C. that once D. once whether
【回答】
C
知识点:连词
题型:选择题
问题详情:
Make sure ______ the experiment is over, all the electric facilities in the lab are turned off.
A. once if B. if once C. that once D. once whether
【回答】
C
知识点:连词
题型:选择题