2. 外语
  3. Although sunlight appears white,______actually a combination of all the colors of the spectrum.

Although sunlight appears white,______actually a combination of all the colors of the spectrum.

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问题 Although sunlight appears white,______actually a combination of all the colors of the spectrum.
选项 A、it is
B、he is
C、which is
D、but it is
答案A
解析 The main clause needs a subject and a verb: it is. The neuter subject pronoun it refers to sunlight.
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