问题描述：
The teacher spoke loudly _ A.so that he could be heard clearer B.so as to be heard much clearer
The teacher spoke loudly _
A.so that he could be heard clearer
B.so as to be heard much clearer
C.in order that he could be heard much more clearly
D.so that he could hear clearly
为什么答案选C呢,求原因.
The teacher spoke loudly _
A.so that he could be heard clearer
B.so as to be heard much clearer
C.in order that he could be heard much more clearly
D.so that he could hear clearly
为什么答案选C呢,求原因.
问题解答：
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