You are not supposed to enter the teachers' office _____（ ）
| A． |
unless you are allowed to |
| B． |
if you want to ask questions |
| C． |
when you are asked to come in |
You are not supposed to enter the teachers' office _____（ ）
| A． |
unless you are allowed to |
| B． |
if you want to ask questions |
| C． |
when you are asked to come in |
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