几道英语题
They had a pleasant chat _____A CUP of coffee
A for ,B with ,C during ,D over.为什么选 D啊
This missile is designed so that once ____nothingcan be done to retrieve it.
A fired B being fire ,C having fired.为什么选A啊？
参考答案:1,D
over在此相当于on，“关于某方面的..”
2,A
"一旦被发射..."
其实是:once it is fired这里"it is"可省略