Once you ____ a promise,you must carry it out.A.have made B.had made C.makes D.is making

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• 单选!英语!HELP!1、Tom said that he had visited the exhibition ________A before long B long agoC long before D for long2、It is six years we ______each otherA will partB shall partC parted D parts3、We all hope to finish the work ________A long beforeB long afterC longD before long 4、Once you _____ a promise,you must carry it out.A is makingB madeC have madeD had made可怜可怜我吧!
• Once you ____ a promise,you must carry it out.A.have made B.had made C.makes D.is making
• Once you have made a promise ,you must carry it out.翻译
• once you ____ a promise,you must carry it out.one you ___ a promise,you must carry it out.A.have made B.had made C.made D.is making但是按照主将从现得原则,应该选C才对啊,they can't leave until they have done their work.这句话中的have done是不是也要根据主将从西现得原则改为finish或者do呢？
• Once you ____ a promise,you must carry it out.A.have made B.had made C.makes D.is making
• Once you have made a promise ,you must carry it out.翻译
• once you ____ a promise,you must carry it out.
• by the end of ,后的句子用什么时态