---Do you know how this disabled man succeeded in running such a big company?I don’t k

---Do you know how this disabled man succeeded in running such a big company?
--- I don’t know , but I think he many difficulties.
A. could have gone through
B. must have gone through
C. might go through
D. need go through

A. could have gone through(答案→)B. must have gone through C. might go throughD. need go through解析：句意：你知道这个残疾人是如何成功地运营这么一个大公司的吗？我不知道，但是我想，他肯定经历了许多困难。问句中succeeded用的是过去时，可知答句中应该是对过去情况的推测。A、B两个选项都可表示对过去情况的推测，但A选项的语气很弱，意为：也许经历了不少困难吧。而根据问句中所说的残疾人成功运营大公司，应该推断他肯定经历了不少困难。故选B。

谢谢了

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