The policeman warned us________ the busy street when the traffic lights are red．（ ）
| A． |
don't cross |
B． |
not crossing |
| C． |
not to cross |
D． |
can't cross |
相关试题
The policeman warned us________ the busy street when the traffic lights are red．（ ）
| A． |
don't cross |
B． |
not crossing |
| C． |
not to cross |
D． |
can't cross |
成等比数列，其公比为3，则
的值为（）
的解集是
, 则
的取值范围是（）
，下列结论中正确的是（）
,
,则
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