题目内容

Shopping on line can provide ____ convenience and choice, but not ____ websites are safe enough for shopping.
A．either; both B．neither; anyC．both; bothD．both; all
D
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。
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