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The teacher spoke loudly _ A.so that he could be heard clear

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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.
选C
老师大声说话为了他的声音能更清晰地被听到
ABclearer是形容词,要用副词修饰hear
D不是他听得更清楚,而是被听