单项选择 适中0.65 引用1 组卷193
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 |
15-16九年级下·江苏·阶段练习
类题推荐
Don’t forget to __________ the lights when you leave the classroom.
| A．turn on | B．turn off | C．turn down | D．turn up |
—I’ve entered a writing competition. But I am not good at ________ a story. Could you help me?
—No problem.
—No problem.
| A．setting up | B．making up | C．putting up | D．taking up |
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