单选题It is a very difficult problem，but I think I shall worked it out by nine o’clock.AI shall work it outBI shall have worked it outCI shall be working it outDI must have worked it out
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。
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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