题目内容
---Who is at the door?
---That ____ John,I'm sure.
A.may be B.must be C.should
B
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—Hi, Mary. __________?
—Not so well. I can’t keep up with the other students.
| A.How long have you studied chemistry |
| B.Who is teaching you chemistry |
| C.How is your chemistry study going |
| D.Where are you learning chemistry |