Ever since he caught the N1H1, Peter _____ so much pain that he is coughing day and night.A.suffered fromB.has suffered from C.suffers fromD.were suffering from
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B解析试题分析：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。考点：考查时态点评：时态的考查要根据上下文的语境和语义，要抓住关键词，本题的关键词就是ever since.