Professor Smith will come here to give a speech. All the preparations must be before 5 o’

问题补充：

Professor Smith will come here to give a speech. All the preparations must be before 5 o’clock.

A. in time

B. in sight

C. in place

D. in control

答案：

A. in time

B. in sight

(答案→)C. in place

D. in control

解析： A及时，迟早；B在视野之内；C在合适的地方；适合；准备就绪；D在控制中；句义：斯密斯教授将要来这里做一个演讲，在5点之前所有的准备工作都要准备就绪。根据句义说明C正确。