2. 外语
  3. ______, all machines are combinations of simpler parts such as the lever, the pulley, and the inclined plane.

______, all machines are combinations of simpler parts such as the lever, the pulley, and the inclined plane.

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问题 ______, all machines are combinations of simpler parts such as the lever, the pulley, and the inclined plane.
选项 A、However complicated are they
B、However difficult they are
C、Whether they are old or new
D、No matter how complex they are
答案D
解析 状语从句题。选项A语序不对，不需用倒装，故排除。B、C语义不符，故选项D正确。
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