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单选题
It is a very difficult problem，but I think I shall worked it out by nine o’clock.
A

I shall work it out

B

I shall have worked it out

C

I shall be working it out

D

I must have worked it out

参考答案

参考解析
解析：
句意：这个问题非常棘手，但我认为能在九点钟之前解决。用by表达的时间状语一般要求谓语动词用完成时态。[B]和[D]的区别是：must have done sth.是表示一种猜测，但此句中must与think之意重复，故不该用。而shall have done sth.则表示有把握。
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