问题
选择题
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
答案：B
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。