找朋友。（选出所给句子的答句，将其字母代号填在括号内。）
This is __________________duck. A. my B. an C. you
I have a __________________. A. pen B. pencil-boxes C. pencils
The elephants often water with trunks. A. drinking it’s. B. drinking their. C. drink their
----Where are your classmates ? ---- ________ over there. A. They’re B. He’s C. She’s
There is a call ______ Mary. A.for B.to C.in
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