执行区域防突措施并经效果检验有效后,在工作面采掘过程中预测有突出危险,应采取()。
A.局部防突措施
B.区域防突措施
C.瓦斯抽放措施
参考答案:A
You ________ come tomorrow. I can do it myself. [ ]
A. needn't
B. mustn't
C. can't
D. shouldn't