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h

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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h

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h
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.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h
once you have made a promise, you must carry it out.
完成时有对现在的影响,一旦你已经做出
这也不是主将从现

一旦你承诺了，你一定要执行。
当然应该选A，因为承诺了但也许执行了也许还没有执行，表示这是一个发生在过去并与现在有关联的动作，所以用现在完成时（have/had+现在分词）。而后半天只是一个祈使句，并无时态的表示。

这是一个虚拟语气，所以要用完成时，你并没有现在作出承诺，但是如果你做了，你就要遵守。
补充问题的答案是：是的，要换成一般现在时，因为until后面的一般现在时可表示将来。
最后告诉LZ，不要太拘泥与所谓的语法规则，除非你是要考试或者作学问出书，不然实际运用才是王道，多读多听，这些题目你不用想就知道答案，因为你平时就是这么说，这么听到的。...

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这是一个虚拟语气，所以要用完成时，你并没有现在作出承诺，但是如果你做了，你就要遵守。
补充问题的答案是：是的，要换成一般现在时，因为until后面的一般现在时可表示将来。
最后告诉LZ，不要太拘泥与所谓的语法规则，除非你是要考试或者作学问出书，不然实际运用才是王道，多读多听，这些题目你不用想就知道答案，因为你平时就是这么说，这么听到的。

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