Only if enough evidence is discovered in the existence of the monster.
A. will people believe
B. people will believe
C. shall people believe
D. people shall believe
网友回答
(答案→)A. will people believe
B. people will believe
C. shall people believe
D. people shall believe
解析：句意：只有足够多的证据被发现，人们才会相信怪兽的存在。only所修饰的副词、介词短语或状语从句位于句首时，要用倒装语序。故选A.