You cannot tell________looking at someone whether or not he has HIV.

A．without　B．by

C．for　D．with

 

B

【解析】考查介詞辨析。句意：你不可能憑外表來判斷一個人是否攜帶HIV病毒。by意為“通過，用……，靠……”，符合句意。

 

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