In discussing about philosophy of time, the growing block theory has been considered as an important third-party position between presentism and eternalism. However, the growing block theory has also arisen some debates, the most crucial of which is the epistemic objection on "present problem". In the past, the most commonsensible argument strategy corresponding to cognitive refutation is the growing block theory, which has pushed the growing block theory into a much worse position. For the growing block theorists, a new response to their theory is the strategy of bullet-biting, and the main reason is that it is more important for the growing block theory to maintain its own theoretical identity and to minimize the cost of the "now-now problem" to some extent, so that it does not constitute a fatal rebuttal to the theory itself. Moreover, in practice the term "now" is a kind of indexical terms and the objective present can not be directly perceived.