— The key may be in your bag.
— .
A. So does it
B. So is it
C. So it does
D. So it is
网友回答
A. So does it
B. So is it
C. So it does
(答案→)D. So it is
解析：so引导的倒装句，其结构为：当主语与上文一致时，用不完全倒装，其结构为So+主语+be
,助动词或情态动词;而当主语与上文主语一致，就用完全倒装，其结构为so+助动词，be动词或情态动词+主语表示另外也是如此。，故选答案为D