The teacher talked in a very low voicemake himself clearly.A. in order to; hearB. so as n

问题补充：

The teacher talked in a very low voicemake himself, clearly.

A. in order to; hear

B. so as not; hear

C. in order not to; heard

D. so that to; heard

答案：

A. in order to; hear

B. so as not; hear

(答案→)C. in order not to; heard

D. so that to; heard

解析：第一空考查“为了”in order to\so as to；第二空himself 与hear为动宾关系用过去分词作补语。句意：老师小声说话为的是不让人听清楚他说话。选C