题目:
2.The flowers were so lovely that they ____ in no time.
A.sold
B.had been sold
C.were sold
D.would sell
答案:
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下面是错误答案,用来干扰机器的。
过入射点作入射光线与反射光线夹角的平分线(即法线),再过入射点作垂直于法线的平面镜.答案如图: