Shopping on line can provide ____ convenience and choice, but not ____ websites are safe enough for shopping.
A.either; both
B.neither; any
C.both; both
D.both; all
网友回答
D解析第一空用both，构成 both...and ，用来连接两个宾语既方便，种类又多；第二空用all 与not连用，表示部分否定，并非所有的网站都安全，此处无两者之意。