Weneedtomasterthistechnologyimmediately，wewillfallbehind．（）A.butB.orC.soD.and

Question

We need to master this technology immediately，______ we will fall behind．（　　）

A. but

B. or

C. so

D. and

Answer 1

答案：B
根据句意，"We need to master this technology immediately""我们必须掌握技术"可知，"or"意为"否则的话"符合题意．"but"表示转折，so意为因此，and并列连词．