— 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
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

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