前面用介詞at,例如:
1、The property is for rent with an option to buy at any time.這房子供出租,但可隨時買下。
2、An active volcano may erupt at any time.活火山會隨時噴發。
3、You can withdraw money from the account at any time without penalty.您可以隨時從賬户中提款,不收罰金。