On this happy occasion, I'd like to say that we are much obliged to you for your kind cooperation.
A. even so
B. ever so
C. as yet
D. so far
网友回答
A. even so
(答案→)B. ever so
C. as yet
D. so far
解析：ever so (=very) 非常; It's ever so cold.与名词搭配时则用ever such, 如：She's ever such a nice girl. (她是一位非常好的姑娘。) even so (=although that is true, nevertheless; still) 即使如此：The fire was out, but even so, the smell of smoke was strong. (=The fire was out, but the smell was still there.)