问题
选择题
Helen had to shout above the sound of the music. [ ]
A. making herself hear
B. to make herself hear
C. making herself heard
D. to make herself heard
答案
答案：D
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Helen had to shout above the sound of the music. [ ]
A. making herself hear
B. to make herself hear
C. making herself heard
D. to make herself heard
答案：D
、
，电势分别为
，则
＞