题目

They were swimming in the river ______ suddenly the storm started. A. when     B. while     C. until     D. before     答案：       A   解析:        题意：他们正在河里游泳，就在那时来了暴风雨。when 连词，意为“就在这时/ 这时”，相当于at the time when.直接写出得数：0.6+9.4=2÷0.2=9.93+0.1=4.04÷4=10-2.3=5.2÷4=0.24×5=2.5×0.4=