2. 外语
  3. (Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.

(Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.

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问题 (Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.
选项 A、Red and green
B、if mixing
C、in
D、will give
答案B
解析 应改为mixed，因为分词和主语Red and green light是动宾关系，因此要用过去分词。本句的意思是：“红光、绿光混合到一起，如果比例恰当的话，就会变成黄色。”
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