——Excuse me, Mrs Bell, do you have a minute?
——Of course, John. How can I help you?
——Well, my English vocabulary is so limited. ________.
——Well, all learners are different and learn in different ways. What do you like doing?
——I like writing.
——So I think it's easier to learn words if you write them down.
句意: —— 贝尔太太, 打扰一下, 你有时间吗 ?
—— 当然有, 约翰。 有什么能帮你的吗 ?
—— 嗯, 我的英语词汇十分有限, 记忆单词最好的方法是什么 ?
根据上下文可知, 约翰应该是问一些与记忆单词有关的问题, 将 D 项代入对话, 符合句意。