______understandfullyhowfilmreactstolight,itisnecessary...

问题详情：

______ understand fully how film reacts to light, it is necessary to study the chemicals in the film.

 A. In order to         B. So as to         C. So that          D. In order that

【回答】

A

知识点：非谓语动词

题型：选择题