2. 外语
  3. (White and black) light, (if mixing) (in) the right proportion, (will show) us grey.

(White and black) light, (if mixing) (in) the right proportion, (will show) us grey.

admin2013-01-03  53
问题 (White and black) light, (if mixing) (in) the right proportion, (will show) us grey.
选项 A、White and black
B、if mixing
C、in
D、will show
答案B
解析 应改为if mixed。应用过去分词mixed表示被动。
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