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It was when Asimov was eleven years old ________ his talent ________ writing became obvious.

A. when; for                 B. that; on                    C. that; for                   D. /; on

C

【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。

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