to finish this position in such a short time is a mystery.
A. How did he manage
B. What did he manage
C. How he managed
D. What he managed
网友回答
A. How did he manage
B. What did he manage
(答案→)C. How he managed
D. What he managed
解析：考查主语从句，句意：他是怎么设法在这么短的时间完成作文的是个迷。所以是how连接主语从句，而且主语从句的语序应该是陈述句语序。选C。