问题
选择题
Grandpa is getting old and he has trouble ________ what others say to him.[ ]
A. hear
B. to hear
C. hearing
D. heard
答案
答案：C
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Grandpa is getting old and he has trouble ________ what others say to him.[ ]
A. hear
B. to hear
C. hearing
D. heard
答案：C
