In my opinion, this is a(n) ____

In my opinion, this is a(n) _____ different matter.
A、entirely
B、merely
C、purely
D、fully
【正确答案】：A
【题目解析】：考查副词词义辨析。句意：依我看来，这是一种完全不同的情况。entirely完全地，彻底地；merely仅仅；purely十足地，纯粹地；fully充分地。