----The pen writes well though it doesnt cost much-Let me have a try. So . A. it i

----The pen writes well though it doesn't cost much.
---- Let me have a try. So .
A. it is
B. it does
C. does it
D. is it

A. it is(答案→)B. it doesC. does itD. is it解析：句意：虽然这支钢笔不值多少钱，但是他很好用。让我试一试，他确实如此。so+助动词+主语:是不完全倒装句，因为助动词动词在主语前面。翻译为：也……so+主语+助动词：是陈述句，起强调作用，翻译为：确实……I am tired ，so is he 。我累了，他也I am tired ，so I am。我累了，确实是累了。so+主语+助动词：这个的主语是往往和主句的主语是一样的结合句意，故选A.

谢谢了