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It is these poisonous products ______can cause the symptom of the flu, such as the headache and aching muscles.
A.whoB.thatC.howD.what
B

试题分析:考查强调句:强调句的结构是it is/was+强调部分+that....,强调的是:these poisonous products,句意:是这些有毒的产品导致了流感的症状,比如头疼和肌肉酸痛。选B。
点评:强调句型在高考中是出现频率很高的考点,关键是要会判断,平时练习时要有这个意识。it is /was+被强调部分+that/who+…判断方法是去掉it is /was  that/who句子不缺成分,即为强调句型。
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