in modern selling, even using the traditional Seven Steps process, every sales person's aim should be to prepare and conduct the selling process so well that there are few if any objections, and no need for a close
the best close these days is something like "Are you happy that we've covered everything and would you like to go ahead?", or simply "Would you like to go ahead?"
in many cases, if the sales person conducts the sale properly, the prospect will close the deal himself, and this should be the another aim for the sales person - it's civilised, respectful, and actually implies and requires a high level of sales professionalism