题目：
30. – Why does the boss look worded?
– Tom left the company a month ago and his work unfinished ever since.
A．has been left
B．was left
C．left
D．is leaving
答案：
答案：A
30．A(解析：考查时态。 since，ever since，so far，in／over／during the last years，for many years等表示一段时间的时间状语常与现在完成时连用，所以，由ever since可知答案选A。)
