问题
选择题
— Where is Mary?
— She must be in the bedroom. I heard her ______ when I passed two minutes ago. [ ]
A. singing
B. to sing
C. writing
D. to write
答案
答案：A
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— Where is Mary?
— She must be in the bedroom. I heard her ______ when I passed two minutes ago. [ ]
A. singing
B. to sing
C. writing
D. to write
答案：A