女生将笔递给了他,时随内心忐忑的接过,抿了下嘴唇,目光扫了一眼试卷,那一排的红勾里,只有一道题的选项被划了一条红色的斜杠,又在边上改了个A选项—— He would have attended the important meeting yesterday if he _____ about it. But unfortunately, no one informed him.
A. had remembered B. would remember C. would have been remembering D. should remember