The headmaster warns us _____________ the school rules，or we'll be punished．（ ）
| A． |
don't break |
B． |
to break |
| C． |
not to break |
D． |
breaking |
The headmaster warns us _____________ the school rules，or we'll be punished．（ ）
| A． |
don't break |
B． |
to break |
| C． |
not to break |
D． |
breaking |
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