问题
Yuan Longping has devoted all his life _______ the research and the _______ of the rice plants.
A:on, development
B:to, development
C:to, developing
D:on, developing;
B:to, development
C:to, developing
D:on, developing;
正确答案是：
同类题型
Look ! There’s ______ football under the teacher’sdesk. Let’s play ________ football, OK
Edde is eight years old, but we have seven candles only, we need______ candle.
What do you think of Beijing— Wonderful. It ________ changed a lot in the last few years.
Do you like ________ here—Oh，yes.The air，the weather，the way of life.Everything is so nice.