What do you do ___________ the morning?
A: onB: for C: in
It’s ___________ elephant
A.an B. a C.\
___________ a black cat.
A: This B: That C: Here’s
___________ Sam at home?
A: Do B: Does C: Is
将每组单词中不同类别的词找出来，将序号填写在括号内。（每小题2分，共10分）
例：(C) A. threeB. four C. tea D. nine
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