(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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