______understandfullyhowfilmreactstolight,itisnecessary...

問題詳情：

______ 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

知識點：非謂語動詞

題型：選擇題