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 |
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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 |
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