He started to work dilligently he came up with the idea of hybrid rice for the first time

问题补充：

He started to work dilligently he came up with the idea of hybrid rice for the first time in the 1960’s.

A. at once

B. the moment

C. for the moment

D. in no time

答案：

A. at once

(答案→)B. the moment

C. for the moment

D. in no time

解析：考查短语。本题考查连词短语the moment一……就……，其它短语不可作连词，故选B。