It is these poisonous products can cause the symptoms of the flu, such as headache and ach

发布时间：2020-08-17 14:11:36

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

网友回答

A. who
(答案→)B. that
C. how
D. what
解析：这是一个强调句，对主语these poisonous products进行强调。
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