摘要：20．-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

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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

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－Have you chosen a topic for your speech yet?

－No．I ________ a lot about it, but I haven't decided．

will think

have been thinking

had thought

was thinking

--Have you chosen a topic for your speech yet?--No, I ________ a lot about it, but I haven't decided.

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--Have you chosen a topic for your speech yet?
--No, I ________ a lot about it, but I haven't decided.