You cannot telllooking at someone whether or not he has HIV.A. without B. byC. for D. with

发布时间:2020-08-17 08:43:53

You cannot tell    looking at someone whether or not he has HIV.
A. without 
B. by
C. for 
D. with

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A. without 
(答案→)B. by
C. for 
D. with
解析:考查介词辨析。句意:你不可能凭外表来判断一个人是否携带HIV病毒。by意为“通过,用……,靠……”,符合句意。
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