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
答案D
解析 状语从句题。本题考查让步状语从句，首先可排除C；A语序不对，不用倒装；B语义上讲不通，因此只有D正确。
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