______ understand fully how film reacts ...

______ 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

A 【解析】试题分析：句意：为了能充分理解灯光对胶卷的作用，有必要研究胶卷中的化学品。In order to 和So as to后面加动词原形，So as to不能用在句首。So that和In order that后加句子。此处是用在句首，后面加动词原形，故选A. 考点：考查近义词辨析。

考点分析：

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