20. I believe you will have a wonderful time here __________ you get to know everyone else.
A
though
B
as if
C
once
D
so that
though虽然；as if好像；once一旦；so that为了。故选项C符合答案。
根据句意：我相信一旦你了解这里的每个人，你将玩得很愉快。
常见连词含义不熟悉。