Having been ill in bed for nearly a month he had a hard time the exam.A. passB. to passC.

问题补充：

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

答案：

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。