In the past several weeks, many cities in Northern China        from heavy fogs and severe cold.
A．had sufferedB．have been sufferingC．were sufferedD．suffered
B               
             
試題分析：考查動詞的時態(tài)。句意 在過去的這幾個星期里，中國北方的許多城市遭受了嚴(yán)重的霧霾。根據(jù)句子中提到的時間狀語In the past several weeks 在過去的這幾周，霧霾天一直都在持續(xù)，所以用現(xiàn)在完成進(jìn)行時來表達(dá)，故選B項(xiàng)。         
考點(diǎn) : 考查動詞的時態(tài)
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