【题目示例】

　　I flew here from London yesterday, [7] ________

　　A. Here’s the number of the baggage check.

　　B. but when I arrived my luggage was missing.

　　C. What flight was it and what time did you arrive at the airport?

　　D. Did you report it when you landed?

　　【答案】B

　　【解析】根据本题前的标点符号为逗号，可知此处应小写开头，而四个选项中只有 B 项

　　为小写开头，可以在不看句意的情况下直接秒杀。故本题选 B。