题目

阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。My father enjoys bike riding.Ever since I was little, I've always loved going hiking with my dad.1, as I became a teenager, other things began to draw my 2. Suddenly, it was important to do things with 3.I saw my dad every evening at home.Why did I have to 4my Sundays, to all day bike trips with him, too? If my indifference （冷漠） hurt him, my father kept 5, but he would always let me know when he was planning a bike trip6 I wanted to come.It was a Sunday morning, a  Make sure that you keep your boss _________ the fresh developments by e-mail.    A. informing of     B. inform of            C. informed of          D. to inform of