“It’s a secret….” he lowered his voice and whispered no one could overhear it.
A. in case
B. even if
C. so that
D. as if
网友回答
A. in case
B. even if
(答案→)C. so that
D. as if
解析：词义辨析。in case以免，以防；even if即使，甚至；．so that以便，为的是；as if仿佛，好像；句意：“这是个秘密”，他压低声音耳语说，以便没有人能偷听。所以选C。