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