They talked in a very low voice ________make themselves ____
They talked in a very low voice ________make themselves ________ clearly. A. in order to; hear B. so as not to; hear C. in order not to; heard D. so that to; heard
答案C 本题要考虑两个知识点.so as to do和in order to do都可以表示目的,只不过so as to不用于句首,两个短语的否定形式都是在不定式符号to前加not或never.so that后面接的是从句.make oneself heard是过去分词作宾语补足语,意为“使自己让别人听见”.综上所述,选项D为正确答案.