The woman refused to ________ the car keys to her husband ________ he had promised to wear his safety belt at once.
句意： 直到丈夫答应立刻系上安全带为止， 不然这位女士是不会将车钥匙给他的。 hand over交出； until直到……为止。 符合句意， 因此答案为C项。 hand in上交； so所以。 hand out分发。 hand down把……传下去； unless除非。