摘要： --Who is knocking at the door? -- . A. I'm, Mary B. She's me, Mary C. He's me D. It's me, Mary
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—Who
is knocking at the door? —________ .
A. I’m, Mary B. She’s me, Mary C. He’s me D. It’s me, Mary
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－Who is knocking at the door?
－________.
[ ]
A．I'm, Mary
B．She's me, Mary
C．He's me
D．It's me, Mary