--Have you chosen a topic for your speech yet?--No, I a lot about it, but I have
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--Have you chosen a topic for your speech yet?
--No, I ________ a lot about it, but I haven't decided.
A.will think
B.have been thinking
C.had thought
D.was thinking
试题答案
B
句意：--你为你的演讲选好了题目了吗？--还没呢。我想了很多，但我还没定呢。根据句意可知说话者从过去直到现在一直在想，且现在还在想，所以用现在完成进行时。