问题

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

正确答案是：

同类题型

Occasions are quite rare _____ I have the time to spend a day with my kids [ ]

the tourist season, there are manypeople wandering in this city to see the old castles _____ in the sixteenth century.

Hdiscover the secret cave.

Last winter, many places of southern China were struck by heavy snowstorms, _____ more than 120 people were killed.

Where does your mother work—she’sworking abroad.