Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.
A．must go throughB．may go through
C．must have gone throughD．could have gone through
C
考查情態(tài)動詞。根據(jù)題意可知本句為對過去事情的推測，故用情態(tài)動詞+ have done，根據(jù)句意可知must have done過去一定做某事，選C。
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