You cannot tell________looking at someone whether or not he has HIV.A．without B．
题型：不详难度：来源：
You cannot tell________looking at someone whether or not he has HIV.| A．without | B．by | | C．for | D．with |
|
答案
| B |
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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