Whoever invented wheel is believed to have made most useful invention in history.A. a; the

问题补充：

Whoever invented wheel is believed to have made most useful invention in history.

A. a; the /;

B. the; the; /

C. the;. /; /

D. a; a; the.

答案：

A. a; the /;

(答案→)B. the; the; /

C. the;. /; /

D. a; a; the.

解析：