ARed and green light, Bif mixing, Cin the right proportion, Dwill give us yellow.

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问题 ARed and green light, Bif mixing, Cin the right proportion, Dwill give us yellow.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为mixed。因为mix和主语“red and green light”是动宾关系,因此要用过去分词。ifmixed=if they are mixed。本句的意思是:“红光、绿光混合到一起,如果比例正确的话,就会呈现黄色。”
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