某国有企业的净资产总额为人民币6.4亿元,现该企业对外投资为人民币1.2亿元。其再次对外投资的数额不得超过人民币()亿元。
A.3.2
B.2.64
C.2
D.1.36
参考答案:C
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