Kate on her new novel, which is supposed to e out next month.
A. has been working
B. had worked
C. will be working
D. was working
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(答案→)A. has been working
B. had worked
C. will be working
D. was working
解析：考查动词时态。根据which is supposed to e out next month可知她的小说还没写完，现在还在写，排除B,C,D；选A，has been working现在完成进行时态，表示从过去到现在一直在写，可能还会写下去。