Ever since he caught the N1H1, Peter so much pain that he is coughing day and night.
A. suffered from
B. has suffered from
C. suffers from
D. were suffering from
网友回答
A. suffered from
(答案→)B. has suffered from
C. suffers from
D. were suffering from
解析：考查时态。本题根据ever since（，自从，从那时到现在）说明使用现在完成时。句意：自从他染上H1N1以后，Peter已经遭受了很多痛苦，以至于他整体咳嗽不停。故B正确。