问题补充：
We used to see each other , but I haven’t head from him since last year.
Aespecially
Bregularly
Cparticularly
Dapproximately
答案：
A. especially
(答案→)B. regularly
C. particularly
D. approximately
解析：A项意为“尤其；特别”；B项意为“定期地，经常地”；C项意为“特别，尤其”；D项意为“近似地，大约”。根据句意“我们原来经常见面，但从去年我就没再收到过他的信”。
【考点】副词词义辨析
