[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.Keep yourself open （ ） we can experience the great joy that friendship can bring.
A
as if
B
so that
C
even though
D
ever since
正确答案：B
题目解析
as if——好像；so that——如此以至于，以便；even though——即使；ever since——自从，从......之后一直。结合句意可以确定表示“以便”的so that 最符合句意，故选B。
