问题描述：
Only by shouting at the top of his voice ______.
A) he was able to make himself hear
B) was he able to make himself hear
C) he was able to make himself heard
D) was he able to make himself heard
为什么选D,
A) he was able to make himself hear
B) was he able to make himself hear
C) he was able to make himself heard
D) was he able to make himself heard
为什么选D,
问题解答：
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