Having been ill in bed for nearly a month ,he had a hard time the exam.
A. pass
B. to pass
C. passed
D. passing
网友回答
A. pass
B. to pass
C. passed
(答案→)D. passing
解析：句意：由于卧病在床几乎一个月之久，因此他非常艰难的通过了考试。Have a hard time /difficulty/trouble ….(in)doing sth.做某事有艰难、困难或有麻烦。