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单选题
______ , all machines are combinations of simpler parts such as the lever, the pulley, and the inclined plane.
A
However complicated are they
B
However difficult they are
C
Whether they are old or new
D
No matter how complex they are
参考答案
参考解析
解析：
无论她们有多复杂，所有的机器都是由简单的部件组成的，像是杠杆，滑轮以及倾斜的滑面。句中需要采用让步状语从句，在however或no matter how引导的状语从句中，要采用正常语序，故排出A项，B、C两项意义与原文不符，故D项正确。
无论她们有多复杂，所有的机器都是由简单的部件组成的，像是杠杆，滑轮以及倾斜的滑面。句中需要采用让步状语从句，在however或no matter how引导的状语从句中，要采用正常语序，故排出A项，B、C两项意义与原文不符，故D项正确。
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