It was when Asimov was eleven years old his talent writing became obvious.
A. when; for
B. that; on
C. that; for
D. /; on
网友回答
A. when; for
B. that; on
(答案→)C. that; for
D. /; on
解析：这题考查强调句和介词：第一空填that是强调句，强调时间状语when Asimov was eleven years old第二空填for，talent for“…的天赋”，句意是：就是在Asimov11岁时，他的写作天赋显现出来了。选C。