题文
Look at the sign "No swimming"， it warns us ________ in the lake．（ ）
| A． |
to swim |
| B． |
not to swim |
| C． |
swimming |
Look at the sign "No swimming"， it warns us ________ in the lake．（ ）
| A． |
to swim |
| B． |
not to swim |
| C． |
swimming |
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