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It is these poisonous products_____can cause the symptoms of the flu , such as headache and aching muscles .

A. who          B. that          C. how   D. what

B


解析:

句意:正是這些有毒物質能夠產生流感征兆,如頭疼、肌肉疼痛等。該題考查強調句型,強調主語。把it is…that 去掉后,句子仍然完整。

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