题目

--- Have you thought of the topic for the composition? 　　　　---Not yet, I _______ it very carefully, but I haven’t decided. 　　A. will consider 　　　　　B. have been considering 　　C. had considered　　　　　D. was considering 答案：B 解析: I haven’t decided yet说明一直在考虑，还没决定，故选B。

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