________being treated, it would produce a harmful chemical that would kill the patient.

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问题 ________being treated, it would produce a harmful chemical that would kill the patient.

选项 A、Unless
B、If
C、As
D、Without

答案D

解析 本题考查连词辨析。unless“如果不,若非”,后血要接从句;if“如果,假若”;as“当……时,随着”;without“无.没”,可表示条件,意为“若无,若非”。句意为“如果不处理,它会产生一种能导致病人死亡的有害化学物质”。故本题选D。
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