Question

Tom made friends with Steven in 2006. Since then, they have written to each other very often.
A. From then on
B. At the same time
C. However

Answer 1

A

解析试题分析：句意：在2006年，汤姆与史蒂芬成为了朋友。自从那时起，他们经常互相通信件。Since then自从那时起；from then on从那时起；at the same time与此同时；however然而。根据题意，故选A。
考点：考查短语辨析。